Update v3.1.0 release date in changelog

Updated GLIBC reequirements for Linux
Solved minor bu in windows shell script (wrong folder structure)
2019-10-21 23:45:37 +02:00 · 2019-10-20 22:09:36 +02:00 · 2019-10-18 16:24:00 +02:00 · 2019-10-17 12:33:30 +02:00 · 2019-10-16 21:20:02 +02:00 · 2019-10-15 19:17:47 +02:00
39 changed files with 7531 additions and 6007 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,9 @@
 __pycache__
 Data
-csv_info.txt
-src/themes/.current_theme
+src/themes/__current_theme
 designer.bat
 launch.bat
 .vscode/
+.code-workspace
+spec_files/**/output
+*.txt
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,25 @@
 # Changelog
-This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) and the format is based on The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) and the format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).

 The first release is [3.0.0] because this is actually the third major version (completely rewritten) of the software.

 ## [Unreleased]
+...
+
+
+## [3.1.0] - 2019-10-21
+### Added
+- Automatic updates. From this version Artemis can update itself if a new version is available. Works only when running the executable version (disabled when running from source). The feature is partially unavailable for Mac, you can only download the new version.
+- The software version displayed has now a `.Dev` appended when running from script (_e.g._ 3.1.0.Dev) to differentiate from an actual binary executable. The `.Dev` thus implies that the running version of the software could not correspond to a particular release.
+- The `*.spec` files can be executed without copying the source code into
+  their folder.
+- Add a link to the GitHub repository in the action bar.
+- Add support for signals with multiple-value acf ([#9](https://github.com/AresValley/Artemis/pull/9)). This partially breaks the backward compatibility because the database changed structure.
+
+### Fixed
+- Adding the `Artemis` folder to `PATH` as the expected behaviour. Prior to this fix, Artemis could not find the `Data` and `themes` folders if started from outside the `Artemis` folder.
+- The audio buttons are of the same dimension also for high resolution screens ([#13](https://github.com/AresValley/Artemis/pull/13))
+- An audio sample can be paused and a different one can be played without a program crash ([#12](https://github.com/AresValley/Artemis/pull/12))

 ## [3.0.1] - 2019-8-1
 ### Added
@@ -20,6 +36,7 @@ First release.


 <!-- Links definitions -->
-[Unreleased]: https://github.com/AresValley/Artemis/compare/v3.0.1...HEAD
+[Unreleased]: https://github.com/AresValley/Artemis/compare/v3.1.0...HEAD
+[3.1.0]: https://github.com/AresValley/Artemis/compare/v3.0.1...v3.1.0
 [3.0.1]: https://github.com/AresValley/Artemis/compare/v3.0.0...v3.0.1
 [3.0.0]: https://github.com/AresValley/Artemis/releases/tag/v3.0.0
--- a/README.md
+++ b/README.md
@@ -12,7 +12,8 @@ In short, ARTEMIS is a signals hunter software and a useful aid for radio listen

  - [Run the software](#Run-the-software)
    - [Run from binary](#Run-from-binary)
-    - [Run from source code](#Run-from-source-code-OS-independent)
+    - [Run from source code](#Run-from-source-code)
+    - [Compile from source code](#Compile-from-source-code)
  - [Database](#database)
    - [Syntax](#syntax)
    - [Multiple Items fields (Location, Modulation)](#multiple-items-fields-location-modulation)
@@ -28,10 +29,17 @@ Artemis 3 is entirely written in Python, so if you already have Python 3.7.0+ in
 **If you don't know what you want or you are not sure where to look, this is for you.** 

 Basically, this is the easiest, smooth, and clean way to run Artemis 3. A Python installation is not required.
-For more information, follow [the main page of Artemis 3](https://aresvalley.com/artemis/) (detailed documentation at the end of the main page)
+For more information, follow [the main page of Artemis 3](https://aresvalley.com/artemis/) (detailed documentation at the end of the main page).
+
+**Requirements:**
+- Windows 7/8/8.1/10
+- Linux: Ubuntu 18.04+, Mint 19+, Fedora 28+ and many other. **You need at least version 2.27 of the GLIBC system library** ([details](https://github.com/AresValley/Artemis/tree/master/spec_files))
+- macOS

 ### Run from source code
-Run the software from the source code with the Python interpreter is the simplest and natural way to run Artemis 3. Requirements:
+Run the software from the source code with the Python interpreter is the simplest and natural way to run Artemis 3.
+
+**Requirements:**
 - Python (ver. 3.7.0+)
 - Python libraries (in `requirements/requirements.txt`)

@@ -49,6 +57,9 @@ pip install -r  requirements.txt --user
 python3 artemis.py
 ```

+### Compile from source code
+If you want to compile Artemis yourself from the source code follow the instructions in the [spec_files/README](spec_files/README.md) file.
+
 ## Database

 The database (db.csv) is directly extracted from sigidwiki.com with a DB parser and reworked to a standard format defined as follow. Artemis DB is a human-readable csv file where the delimiter is the character `*` (Asterisk, Unicode: U+002A). The new entry (separation between signals) is the End Of Line (EOL) escape sequence `\n`. Every signal is directly connected to spectra and audio sample stored in **Spectra** and **Audio** folders, respectively. Every signal is composed of 12 columns:
@@ -66,7 +77,7 @@ The database (db.csv) is directly extracted from sigidwiki.com with a DB parser
 | 9 | Description | - | - | string |
 | 10 | Modulation | - | ✔ | string |
 | 11 | ID Code | - | - | integer |
-| 12 | Auto-correlation function | ms | - | string |
+| 12 | Auto-correlation function | ms | ✔ | string |

 ### Syntax

@@ -99,17 +110,35 @@ The database (db.csv) is directly extracted from sigidwiki.com with a DB parser
    |:-:|:-:|:-:|:-:|:-:|:-:|:-:|
    | Trunked | Utility | Sat | Navigation | Interfering | Number Stations | Time Signal |

-12. **Auto-correlation funtion (ACF)**: The ACF is an awesome discriminator when the signal is composed of redundant pattern that continouosly repeats. It is reported in **ms**. An extended description with an example signal analysis is available here: https://aresvalley.com/documentation/
+12. **Auto-correlation funtion (ACF)**: The ACF is an awesome discriminator when the signal is composed of redundant pattern that continouosly repeats. Unfortunately, for this reason, ACF is not always available. The time value is reported in **ms** and, in some cases, could have multiple values for a single signal. An extended description with an example signal analysis is available here: https://aresvalley.com/documentation/
+
+
+```
+... ID Code * ACF1 Description - ACF1 Value (in ms) ; ACF2 Description - ACF2 Value (in ms) ; ...
+```
+
+**Example 1 (D-STAR):**
+
+```
+... ID Code * Superframe - 420 ; Frame - 20
+```
+**Example 2 (EDACS):**
+
+```
+... ID Code * edacs48 - 60 ; edacs96 - 30
+```
+
+**Special case:** variable ACFs are allowed and a brief explanation can be reported instead of ACF Value. A nice example is the * [SSTV](https://www.sigidwiki.com/wiki/Slow-Scan_Television_(SSTV) "SSTV") transmission where the ACF is directly related to the number of lines per minute.

 ### Multiple Items fields (Location, Modulation)
 The necessity to manage a multiple Location/Modulation search pushed us to implement a fictitious 'secondary delimiter' chosen to be the `;` character. For instance:

 ```
-Band. Upper Limit * Location 1 ; Location 2 ; ... * sigidwiki URL
+... Band. Upper Limit * Location 1 ; Location 2 ; ... * sigidwiki URL ...
 ```
 or
 ```
-Description * Modulation 1 ; Modulation 2 ; ... * ID Code
+... Description * Modulation 1 ; Modulation 2 ; ... * ID Code ...
 ```

 ## Themes
@@ -129,6 +158,6 @@ You should have received a copy of the GNU General Public License along with thi
 * [**Alessandro Ceccato**](https://github.com/alessandro90 "GitHub profile") - *Artemis III lead developer*
 * **Paolo Romani (IZ1MLL)** - *Lead β Tester, RF specialist*
 * **Carl Colena** - *Sigidwiki admin, β Tester, Signals expert*
-* **Marco Bortoli** - *macOS deployment, β Tester*
-* **Pierpaolo Pravatto** - *Wiki page, β Tester*
-* **Francesco Capostagno, Luca, Pietro** - *β Tester*
+* [**Marco Bortoli**](https://github.com/marbort "GitHub profile") - *macOS deployment, β Tester*
+* [**Pierpaolo Pravatto**](https://github.com/ppravatto "GitHub profile") - *Wiki page, β Tester*
+* [**Francesco Capostagno**](https://github.com/fcapostagno "GitHub profile"), **Luca**, **Pietro** - *β Tester*
--- a/artemis-workspace.code-workspace
+++ b/artemis-workspace.code-workspace
@@ -0,0 +1,7 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	]
+}
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -1,7 +1,8 @@
+numpy==1.17.2
 pandas>=0.24.2
 certifi>=2019.6.16
 aiohttp>=3.5.4
 urllib3==1.24.3
 pygame>=1.9.6
-QtAwesome>=0.5.7
+QtAwesome>=0.6.0
 PyQt5==5.12.2
--- a/spec_files/Linux/Artemis.spec
+++ b/spec_files/Linux/Artemis.spec
@@ -1,13 +1,21 @@
 # -*- mode: python -*-

+import glob
+import os
+
+
 block_cipher = None

-import glob, os

-data_file = [(f, '.') for f in glob.glob('*.[pu][yi]') if f != "artemis.py"]
-data_file.append(('cacert.pem', '.'))
+SRC_PATH = "../../src/"

-a = Analysis(['artemis.py'],
+data_file = [
+    (f, '.') for f in glob.glob(SRC_PATH + '*.[pu][yi]')
+    if f.split('/')[-1] != "artemis.py" and f.split('/')[-1] != "updater.py"
+]
+data_file.append((SRC_PATH + 'cacert.pem', '.'))
+
+a = Analysis([SRC_PATH + 'artemis.py'],  # noqa: 821
             pathex=[os.getcwd()],
             binaries=[],
             datas=data_file,
@@ -19,9 +27,10 @@ a = Analysis(['artemis.py'],
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
-pyz = PYZ(a.pure, a.zipped_data,
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
          cipher=block_cipher)
-exe = EXE(pyz,
+exe = EXE(pyz,  # noqa: 821
          a.scripts,
          a.binaries,
          a.zipfiles,
--- a/spec_files/Linux/Artemis_onedir.spec
+++ b/spec_files/Linux/Artemis_onedir.spec
@@ -0,0 +1,49 @@
+# -*- mode: python -*-
+
+import glob
+import os
+
+
+block_cipher = None
+
+
+SRC_PATH = "../../src/"
+
+data_file = [
+    (f, '.') for f in glob.glob(SRC_PATH + '*.[pu][yi]')
+    if f.split('/')[-1] != "artemis.py"
+]
+data_file.append((SRC_PATH + 'cacert.pem', '.'))
+
+a = Analysis([SRC_PATH + 'artemis.py'],  # noqa: 821
+             pathex=[os.getcwd()],
+             binaries=[],
+             datas=data_file,
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
+          cipher=block_cipher)
+exe = EXE(pyz,  # noqa: 821
+          a.scripts,
+          [],
+          exclude_binaries=True,
+          name='Artemis',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          console=False)
+coll = COLLECT(exe,  # noqa: 821
+               a.binaries,
+               a.zipfiles,
+               a.datas,
+               strip=False,
+               upx=True,
+               name='Artemis')
--- a/spec_files/Linux/build.sh
+++ b/spec_files/Linux/build.sh
@@ -0,0 +1,42 @@
+echo "Build Artemis executable.."
+
+rm -rf output
+
+mkdir output
+mkdir output/artemis
+
+pyinstaller Artemis.spec
+
+mv -v ./dist/Artemis ./output/Artemis
+rm -rfv dist build
+
+echo "Build _ArtemisUpdater.."
+
+pyinstaller updater.spec
+
+mv -v ./dist/_ArtemisUpdater ./output/_ArtemisUpdater
+rm -rfv dist build
+
+echo "Create single archives"
+cd output
+
+cp -r ../../../src/themes artemis/themes
+rm -f artemis/themes/__current_theme
+cp Artemis artemis/Artemis
+cp _ArtemisUpdater artemis/_ArtemisUpdater
+
+tar -czvf Artemis_linux.tar.gz Artemis -C artemis themes
+tar -czvf _ArtemisUpdater_linux.tar.gz ./_ArtemisUpdater
+
+echo "Create full archive for website"
+
+cp ../artemis3.svg artemis
+cp ../create_shortcut.sh artemis
+
+tar -czvf ArtemisWebDownlaod_linux.tar.gz artemis
+
+echo "Get size and sha256"
+python ../../__get_hash_code.py Artemis_linux.tar.gz _ArtemisUpdater_linux.tar.gz ArtemisWebDownlaod_linux.tar.gz
+
+cd ..
+echo "Done."
--- a/spec_files/Linux/updater.spec
+++ b/spec_files/Linux/updater.spec
@@ -0,0 +1,51 @@
+# -*- mode: python ; coding: utf-8 -*-
+
+import os
+
+
+BASE_FOLDER = "../../src/"
+block_cipher = None
+
+data_file = [
+    (os.path.join(BASE_FOLDER, "download_db_window.ui"), "."),
+    (os.path.join(BASE_FOLDER, "download_window.py"), "."),
+    (os.path.join(BASE_FOLDER, "utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "versioncontroller.py"), "."),
+    (os.path.join(BASE_FOLDER, "downloadtargetfactory.py"), "."),
+    (os.path.join(BASE_FOLDER, "executable_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "os_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "web_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "constants.py"), "."),
+    (os.path.join(BASE_FOLDER, "threads.py"), "."),
+    (os.path.join(BASE_FOLDER, "default_imgs_rc.py"), "."),
+    (os.path.join(BASE_FOLDER, "cacert.pem"), "."),
+]
+a = Analysis([os.path.join(BASE_FOLDER, 'updater.py')],  # noqa: 821
+             pathex=[os.getcwd()],
+             binaries=[],
+             datas=data_file,
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
+          cipher=block_cipher)
+exe = EXE(pyz,  # noqa: 821
+          a.scripts,
+          a.binaries,
+          a.zipfiles,
+          a.datas,
+          [],
+          name='_ArtemisUpdater',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          runtime_tmpdir=None,
+          console=False,
+          icon='Artemis3.ico')
--- a/spec_files/README.md
+++ b/spec_files/README.md
@@ -6,34 +6,47 @@

 ## ARTEMIS 3 .SPEC FILES

-Artemis 3 .spec files are used by the package **pyinstaller** (https://www.pyinstaller.org/) to build a single standalone executable. The extreme versatility of this package is the fact that every external dependency is already embedded into the bundle. The interpreter of Python 3 is also included.
+Artemis 3 .spec files are used by the package **pyinstaller** (https://www.pyinstaller.org/) to build a single standalone executable (or a one-dir package). Every external dependency is already embedded into the bundle. The interpreter of Python 3 is also included.

 ## Requirements
 - Python 3.7.0+
 - Pyinstaller

-## Package Building
-**IMPORTANT:** *To generate the standalone, you must use an operating system that coincides with the target one (pyinstaller doesn't allow cross-compilation).* 
-1. Download a fresh copy of the git repository.
-2. Choose the target OS in `spec_files` folder and copy the whole content into `src`
-3. Open a terminal into `src` and run:
+**IMPORTANT:** *To generate the standalone and the one-dir package, you must use an operating system that coincides with the target one (pyinstaller doesn't allow cross-compilation).* 
+
+**IMPORTANT (LINUX COMPILING):** *The executable that PyInstaller builds is not fully static, in that it still depends on the system libc. **Under Linux, the ABI of GLIBC is backward compatible, but not forward compatible. So if you link against a newer GLIBC, you can't run the resulting executable on an older system**. The supplied binary bootloader should work with older GLIBC. However, the libpython.so and other dynamic libraries still depend on the newer GLIBC. The solution is to compile the Python interpreter with its modules (and also probably bootloader) on the oldest system you have around so that it gets linked with the oldest version of GLIBC.* (Source: PyInstaller)
+
+**NOTE.** Depending on the number of packages installed in your python environemnt, the size of the executables file can vary significantly. In order to get the smallest size possible it is recommend to initialize a fresh virtual environment with just the requirements and pyinstaller.
+
+## Package Building (standalone aka one-file, high portability, **suggested**)
+1. Download/clone the git repository.
+2. In the `spec_files/<your OS>` folder open a terminal and type
 ```
 pyinstaller Artemis.spec
 ```
-4. The ready-to-use compiled software is now present into `src/dist` folder.
+3. An Artemis executable should be produced in the `dist/` folder. The `build/` folder
+   can be deleted.

-## License
-This program (ARTEMIS 3, 2014-2019) is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+## Package Building (one-dir, shorter startup time, low portability)
+1. Download/clone the git repository.
+2. In the `spec_files/<your OS>` folder open a terminal and type
+```
+pyinstaller Artemis_onedir.spec
+```
+3. An Artemis executable should be produced in  `dist/Artemis/`. The `build/` can
+   be deleted.

-This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

-You should have received a copy of the GNU General Public License along with this program. If not, see: www.gnu.org/licenses
+You can save a copy of the executable in a folder of you choice. At startup it will ask you to download the database and also warn you that the `themes` folder is missing. To avoid this, copy `src/Data` and `src/themes` in the folder containing the executable.

-## Thanks
-* **Marco Dalla Tiezza** - *Artemis I-II developer, DB parsing, Website*
-* [**Alessandro Ceccato**](https://github.com/alessandro90 "GitHub profile") - *Artemis III lead developer*
-* **Paolo Romani (IZ1MLL)** - *Lead β Tester, RF specialist*
-* **Carl Colena** - *Sigidwiki admin, β Tester, Signals expert*
-* **Marco Bortoli** - *macOS deployment, β Tester*
-* **Pierpaolo Pravatto** - *Wiki page, β Tester*
-* **Francesco Capostagno, Luca, Pietro** - *β Tester*
+## Build scripts
+Provided you satisfy the requirements (see [requirements.txt](../requirements/requirements.txt)) and have pyinstaller installed, running a `build.*` script in `<your os>` folder will produce an `output` folder with:
+
+- Executable versions of Artemis and the updater;
+  - compressed versions of the same files;
+- a folder called `Artemis/` containing the executables and the `theme` folder
+  - a compressed version of the folder
+
+At the end of the process the script writes on standard output the size and sha256 code for the compressed files.
+
+**NOTE.** For Windows you will need a 7z installation. Also check the path hardcoded in `/Windows/build.bat`.
--- a/spec_files/Windows/Artemis_onedir.spec
+++ b/spec_files/Windows/Artemis_onedir.spec
@@ -0,0 +1,50 @@
+# -*- mode: python -*-
+
+import glob
+import os
+
+
+block_cipher = None
+
+
+SRC_PATH = "../../src/"
+
+data_file = [
+    (f, '.') for f in glob.glob(SRC_PATH + '*.[pu][yi]')
+    if f.split('/')[-1] != "artemis.py"
+]
+data_file.append((SRC_PATH + 'cacert.pem', '.'))
+
+a = Analysis(SRC_PATH + ['artemis.py'],  # noqa: 821
+             pathex=[os.getcwd()],
+             binaries=[],
+             datas=data_file,
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
+          cipher=block_cipher)
+exe = EXE(pyz,  # noqa: 821
+          a.scripts,
+          [],
+          exclude_binaries=True,
+          name='Artemis',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          console=False,
+          icon='Artemis3.ico')
+coll = COLLECT(exe,  # noqa: 821
+               a.binaries,
+               a.zipfiles,
+               a.datas,
+               strip=False,
+               upx=True,
+               name='Artemis')
--- a/spec_files/Windows/artemis.spec
+++ b/spec_files/Windows/artemis.spec
@@ -1,13 +1,21 @@
 # -*- mode: python -*-

+import glob
+import os
+
+
 block_cipher = None

-import glob,os

-data_file = [(f, '.') for f in glob.glob('*.[pu][yi]') if f != "artemis.py"]
-data_file.append(('cacert.pem', '.'))
+SRC_PATH = "../../src/"

-a = Analysis(['artemis.py'],
+data_file = [
+    (f, '.') for f in glob.glob(SRC_PATH + '*.[pu][yi]')
+    if f.split('/')[-1] != "artemis.py" and f.split('/')[-1] != "updater.py"
+]
+data_file.append((SRC_PATH + 'cacert.pem', '.'))
+
+a = Analysis([SRC_PATH + 'artemis.py'],  # noqa: 821
             pathex=[os.getcwd()],
             binaries=[],
             datas=data_file,
@@ -19,9 +27,10 @@ a = Analysis(['artemis.py'],
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
-pyz = PYZ(a.pure, a.zipped_data,
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
          cipher=block_cipher)
-exe = EXE(pyz,
+exe = EXE(pyz,  # noqa: 821
          a.scripts,
          a.binaries,
          a.zipfiles,
@@ -33,4 +42,6 @@ exe = EXE(pyz,
          strip=False,
          upx=True,
          runtime_tmpdir=None,
-          console=False , icon='Artemis3.ico')
+          console=False,
+          icon='Artemis3.ico',
+          uac_admin=True)
--- a/spec_files/Windows/build.bat
+++ b/spec_files/Windows/build.bat
@@ -0,0 +1,30 @@
+ECHO OFF
+ECHO Building Artemis executable...
+RMDIR /s /q output
+MKDIR output
+pyinstaller artemis.spec
+ECHO Remove directories
+MOVE dist\Artemis.exe .\output\Artemis.exe
+RMDIR /s /q dist
+RMDIR /s /q build
+ECHO *************
+ECHO *************
+ECHO Building updater...
+pyinstaller updater.spec
+ECHO Remove directories
+MOVE dist\_ArtemisUpdater.exe .\output\_ArtemisUpdater.exe
+RMDIR /s /q dist
+RMDIR /s /q build
+CD output
+MKDIR Artemis
+XCOPY /y Artemis.exe Artemis\
+XCOPY /e /k /y ..\..\..\src\themes Artemis\themes\ /EXCLUDE:..\excluded_files.txt
+XCOPY /y _ArtemisUpdater.exe Artemis\
+ECHO "Compress files themes+Artemis.exe -> Artemis.zip"
+"C:\Program Files\7-Zip\7z.exe" a Artemis_win.zip Artemis.exe ..\..\..\src\themes
+"C:\Program Files\7-Zip\7z.exe" a _ArtemisUpdater_win.zip _ArtemisUpdater.exe
+ECHO "Compress all files for website download"
+"C:\Program Files\7-Zip\7z.exe" a ArtemisWebsite_win.zip Artemis\
+python ..\..\__get_hash_code.py Artemis_win.zip _ArtemisUpdater_win.zip ArtemisWebsite_win.zip
+CD ..
+ECHO Done.
--- a/spec_files/Windows/excluded_files.txt
+++ b/spec_files/Windows/excluded_files.txt
@@ -0,0 +1 @@
+__current_theme
--- a/spec_files/Windows/updater.spec
+++ b/spec_files/Windows/updater.spec
@@ -0,0 +1,52 @@
+# -*- mode: python ; coding: utf-8 -*-
+
+import os
+
+
+BASE_FOLDER = "../../src/"
+block_cipher = None
+
+data_file = [
+    (os.path.join(BASE_FOLDER, "download_db_window.ui"), "."),
+    (os.path.join(BASE_FOLDER, "download_window.py"), "."),
+    (os.path.join(BASE_FOLDER, "utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "versioncontroller.py"), "."),
+    (os.path.join(BASE_FOLDER, "downloadtargetfactory.py"), "."),
+    (os.path.join(BASE_FOLDER, "executable_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "os_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "web_utilities.py"), "."),
+    (os.path.join(BASE_FOLDER, "constants.py"), "."),
+    (os.path.join(BASE_FOLDER, "threads.py"), "."),
+    (os.path.join(BASE_FOLDER, "default_imgs_rc.py"), "."),
+    (os.path.join(BASE_FOLDER, "cacert.pem"), "."),
+]
+a = Analysis([os.path.join(BASE_FOLDER, 'updater.py')],  # noqa: 821
+             pathex=[os.getcwd()],
+             binaries=[],
+             datas=data_file,
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
+          cipher=block_cipher)
+exe = EXE(pyz,  # noqa: 821
+          a.scripts,
+          a.binaries,
+          a.zipfiles,
+          a.datas,
+          [],
+          name='_ArtemisUpdater',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          runtime_tmpdir=None,
+          console=False,
+          icon='Artemis3.ico',
+          uac_admin=True)
--- a/spec_files/__get_hash_code.py
+++ b/spec_files/__get_hash_code.py
@@ -0,0 +1,31 @@
+import hashlib
+import sys
+
+
+"""Print on stadard output the size in KB and sha256 codes of a list
+of command line-provided file names."""
+
+print()
+
+try:
+    fnames = sys.argv[1:]
+except Exception:
+    print("Provide a valid filename.")
+    exit()
+
+for fname in fnames:
+    try:
+        with open(fname, mode='rb') as f:
+            target = f.read()
+    except Exception:
+        print("File not found")
+        exit()
+
+    code = hashlib.sha256()
+    code.update(target)
+    hash_code = code.hexdigest()
+
+    print("File name:", fname)
+    print("Size (KB):", round(len(target) / 1024, 3))
+    print("Hash code:", hash_code)
+    print("-" * 80)
--- a/spec_files/macOS/Artemis.spec
+++ b/spec_files/macOS/Artemis.spec
@@ -1,13 +1,21 @@
 # -*- mode: python -*-

+import glob
+import os
+
+
 block_cipher = None
-import glob, os

-data_file = [(f, '.') for f in glob.glob('*.[pu][yi]') if f != "artemis.py"]
-data_file.append(('themes','./themes'))
-data_file.append(('cacert.pem', '.'))

-a = Analysis(['artemis.py'],
+SRC_PATH = "../../src/"
+
+data_file = [
+    (f, '.') for f in glob.glob(SRC_PATH + '*.[pu][yi]')
+    if f.split('/')[-1] != "artemis.py"
+]
+data_file.extend(((SRC_PATH + 'cacert.pem', '.'), (SRC_PATH + 'themes', './themes')))
+
+a = Analysis([SRC_PATH + 'artemis.py'],  # noqa: 821
             pathex=[os.getcwd()],
             binaries=[],
             datas=data_file,
@@ -19,9 +27,10 @@ a = Analysis(['artemis.py'],
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
-pyz = PYZ(a.pure, a.zipped_data,
+pyz = PYZ(a.pure,  # noqa: 821
+          a.zipped_data,
          cipher=block_cipher)
-exe = EXE(pyz,
+exe = EXE(pyz,  # noqa: 821
          a.scripts,
          [],
          exclude_binaries=True,
@@ -30,15 +39,15 @@ exe = EXE(pyz,
          bootloader_ignore_signals=False,
          strip=False,
          upx=True,
-          console=False )
-coll = COLLECT(exe,
+          console=False)
+coll = COLLECT(exe,  # noqa: 821
               a.binaries,
               a.zipfiles,
               a.datas,
               strip=False,
               upx=True,
               name='Artemis')
-app = BUNDLE(coll,
+app = BUNDLE(coll,  # noqa: 821
             name='Artemis.app',
             icon='Artemis3.icns',
             bundle_identifier=None)
--- a/src/acfvalue.py
+++ b/src/acfvalue.py
@@ -0,0 +1,56 @@
+from constants import Constants
+
+
+class ACFValue:
+    """Handle complex/multiple ACF values."""
+
+    def __init__(self, value):
+        """Given a string describing an acf value, build an object with the
+        following attrributes:
+        - is_numeric: whether the value is a number or a string;
+        - numeric_value: the numeric value (if any, zero otherwise);
+        - unknown: whether the value is unknown."""
+        if value == Constants.UNKNOWN:
+            self._value = value
+            self._description = ""
+            self._string = self._value
+            self.is_numeric = False
+            self.unknown = True
+            self.numeric_value = 0.0
+        else:
+            self.unknown = False
+            if Constants.ACF_SEPARATOR in value:
+                description, acf_value = value.split(Constants.ACF_SEPARATOR)
+                self._description = description
+                self._value = acf_value
+                self._string = f"{self._description}: {self._value}"
+            else:
+                self._description = ""
+                self._value = value
+                self._string = self._value
+            try:
+                self.numeric_value = float(self._value)
+            except Exception:
+                self.is_numeric = False
+                self.numeric_value = 0.0
+            else:
+                self.is_numeric = True
+                self._string += " ms"
+
+    @classmethod
+    def list_from_series(cls, series):
+        """Parse all acf values from the database.
+
+        Accept an iterable of ACFValues.
+        Return a list of lists of ACFValues."""
+        entries = []
+        for entry in series:
+            entries.append([
+                cls(value.rstrip('ms').strip()) for value in entry.split(Constants.FIELD_SEPARATOR)
+            ])
+        return entries
+
+    @staticmethod
+    def concat_strings(acf_list_values):
+        """Concatenate a list of ACFValues to be displayed."""
+        return '\n'.join(s._string for s in acf_list_values)
--- a/src/artemis.py
+++ b/src/artemis.py
--- a/src/artemis.ui
+++ b/src/artemis.ui
--- a/src/audio_player.py
+++ b/src/audio_player.py
@@ -2,15 +2,15 @@ import os
 from pygame import mixer
 from PyQt5.QtCore import QTimer, pyqtSlot, QObject

-from constants import Constants
 import qtawesome as qta
+from constants import Constants


 class AudioPlayer(QObject):
    """Subclass QObject. Audio player widget for the audio samples.

    The only public methods are the __init__
-    method, set_audio_player, which loads the current file and refresh_btns_colors.
+    method, set_audio_player, which loads the current file and refresh.
    Everything else is managed internally."""

    _TIME_STEP = 500  # Milliseconds.
@@ -47,7 +47,7 @@ class AudioPlayer(QObject):
        self._pause.setIconSize(self._pause.size())
        self._stop.setIconSize(self._stop.size())
        self._loop.setIconSize(self._loop.size())
-        self.refresh_btns_colors(active_color, inactive_color)
+        self.refresh(active_color, inactive_color)

    @pyqtSlot()
    def _set_loop_icon(self):
@@ -67,7 +67,7 @@ class AudioPlayer(QObject):
            )
        self._loop.setIcon(loop_icon)

-    def refresh_btns_colors(self, active_color, inactive_color):
+    def refresh(self, active_color, inactive_color):
        """Repaint the buttons of the widgetd after the theme has changed."""
        self._active_color = active_color
        self._inactive_color = inactive_color
@@ -92,6 +92,8 @@ class AudioPlayer(QObject):

    def _reset_audio_widget(self):
        """Reset the widget. Stop all playing samples."""
+        self._first_call = True
+        self._paused = False
        if mixer.get_init():
            if mixer.music.get_busy():
                mixer.music.stop()
@@ -123,10 +125,8 @@ class AudioPlayer(QObject):

    def set_audio_player(self, fname=""):
        """Set the current audio sample."""
-        self._first_call = True
        self._reset_audio_widget()
        full_name = os.path.join(
-            Constants.DATA_FOLDER,
            Constants.AUDIO_FOLDER,
            fname + '.ogg'
        )
--- a/src/constants.py
+++ b/src/constants.py
@@ -1,13 +1,21 @@
 from collections import namedtuple
 from enum import Enum, auto
 import os.path
+from executable_utilities import get_executable_path
+
+
+__BASE_FOLDER__ = get_executable_path()
+
+
+class SupportedOs:
+    """Supported operating systems."""
+    WINDOWS = "windows"
+    LINUX   = "linux"
+    MAC     = "mac"


 class Ftype:
-    """Container class to differentiate between frequency and band.
-
-    Used in reset_fb_filters.
-    """
+    """Container class to differentiate between frequency and band."""

    FREQ = "freq"
    BAND = "band"
@@ -20,30 +28,13 @@ class GfdType(Enum):
    LOC  = auto()


-class ChecksumWhat(Enum):
-    """Enum class to distinguish the object you want to verify the checksum."""
+class DownloadTarget(Enum):
+    """Enum class to distinguish the object being downloaded."""

-    FOLDER = auto()
+    DATA_FOLDER = auto()
    DB          = auto()
-
-
-class Messages:
-    """Container class for messages to be displayed."""
-
-    DB_UP_TO_DATE            = "Already up to date"
-    DB_UP_TO_DATE_MSG        = "No newer version to download."
-    DB_NEW_VER               = "New version available"
-    DB_NEW_VER_MSG           = "A new version of the database is available for download."
-    NO_DB_AVAIL              = "No database detected."
-    NO_DB                    = "No database"
-    DOWNLOAD_NOW_QUESTION    = "Do you want to download it now?"
-    DOWNLOAD_ANYWAY_QUESTION = "Do you want to download it anyway?"
-    NO_CONNECTION            = "No connection"
-    NO_CONNECTION_MSG        = "Unable to establish an internet connection."
-    BAD_DOWNLOAD             = "Something went wrong"
-    BAD_DOWNLOAD_MSG         = "Something went wrong with the downaload.\nCheck your internet connection and try again."
-    SLOW_CONN                = "Slow internet connection"
-    SLOW_CONN_MSG            = "Your internet connection is unstable or too slow."
+    SOFTWARE    = auto()
+    UPDATER     = auto()


 class Signal:
@@ -88,7 +79,8 @@ class Database:
                 Signal.MODE,
                 Signal.INF_BAND,
                 Signal.SUP_BAND,
-                 Signal.CATEGORY_CODE)
+                 Signal.CATEGORY_CODE,
+                 Signal.ACF,)


 class ForecastColors:
@@ -108,11 +100,15 @@ _Band = namedtuple("Band", ["lower", "upper"])
 class Constants:
    """Container class for several constants of the software."""

+    EXECUTABLE_NAME         = os.path.join(__BASE_FOLDER__, "Artemis")
+    UPDATER_SOFTWARE        = os.path.join(__BASE_FOLDER__, "_ArtemisUpdater")
    CLICK_TO_UPDATE_STR     = "Click to update"
+    VERSION_LINK            = "https://aresvalley.com/Storage/Artemis/Package/latest_versions.json"
    SIGIDWIKI               = "https://www.sigidwiki.com/wiki/Signal_Identification_Guide"
    ADD_SIGNAL_LINK         = "https://www.sigidwiki.com/index.php/Special:FormEdit/Signal/?preload=Signal_Identification_Wiki:Signal_form_preload_text"
    FORUM_LINK              = "https://aresvalley.com/community/"
    ARESVALLEY_LINK         = "https://aresvalley.com/"
+    GITHUB_REPO             = "https://github.com/AresValley/Artemis"
    RTL_SDL_LINK            = "https://www.rtl-sdr.com/"
    UPDATING_STR            = "Updating..."
    ACF_DOCS                = "https://aresvalley.com/documentation/"
@@ -134,10 +130,7 @@ class Constants:
                               "https://amunters.home.xs4all.nl/aurorastatus.gif"]
    SEARCH_LABEL_IMG        = "search_icon.png"
    VOLUME_LABEL_IMG        = "volume.png"
-    DATA_FOLDER             = "Data"
-    SPECTRA_FOLDER          = "Spectra"
    SPECTRA_EXT             = ".png"
-    AUDIO_FOLDER            = "Audio"
    ACTIVE                  = "active"
    INACTIVE                = "inactive"
    LABEL_ON_COLOR          = "on"
@@ -181,6 +174,62 @@ class Constants:
    NOT_AVAILABLE           = "spectrumnotavailable.png"
    NOT_SELECTED            = "nosignalselected.png"
    FIELD_SEPARATOR         = ";"
+    ACF_SEPARATOR           = " - "
+    DATA_FOLDER             = os.path.join(__BASE_FOLDER__, "Data")
+    SPECTRA_FOLDER          = os.path.join(DATA_FOLDER, "Spectra")
+    AUDIO_FOLDER            = os.path.join(DATA_FOLDER, "Audio")
    DEFAULT_IMGS_FOLDER     = os.path.join(":", "pics", "default_pics")
    DEFAULT_NOT_SELECTED    = os.path.join(DEFAULT_IMGS_FOLDER, NOT_SELECTED)
    DEFAULT_NOT_AVAILABLE   = os.path.join(DEFAULT_IMGS_FOLDER, NOT_AVAILABLE)
+
+
+class Messages:
+    """Container class for messages to be displayed."""
+
+    FEATURE_NOT_AVAILABLE    = "Feature not available"
+    SCRIPT_NOT_UPDATE        = "When running from source, software updates\ncannot be checked."
+    UPDATES_AVAILABALE       = "Updates available"
+    UPDATES_MSG              = "Do you want to install the updates now?"
+    UP_TO_DATE               = "Already up to date"
+    UP_TO_DATE_MSG           = "No newer version to download."
+    DB_NEW_VER               = "New version available"
+    DB_NEW_VER_MSG           = "A new version of the database is available for download."
+    NO_DB_AVAIL              = "No database detected."
+    NO_DB                    = "No database"
+    DOWNLOAD_NOW_QUESTION    = "Do you want to download it now?"
+    DOWNLOAD_ANYWAY_QUESTION = "Do you want to download it anyway?"
+    NO_CONNECTION            = "No connection"
+    NO_CONNECTION_MSG        = "Unable to establish an internet connection."
+    BAD_DOWNLOAD             = "Something went wrong"
+    BAD_DOWNLOAD_MSG         = "Something went wrong with the download.\nCheck your internet connection and try again."
+    SLOW_CONN                = "Slow internet connection"
+    SLOW_CONN_MSG            = "Your internet connection is unstable or too slow."
+    NEW_VERSION_AVAILABLE    = "New software version"
+    NEW_VERSION_MSG          = lambda v: f"The software version {v} is available."  # noqa: E731
+    DOWNLOAD_SUGG_MSG        = "Download new version now?"
+
+
+class ThemeConstants:
+    """Container class for all the theme-related constants."""
+
+    EXTENSION                 = ".qss"
+    ICONS_FOLDER              = "icons"
+    DEFAULT                   = "dark"
+    CURRENT                   = "__current_theme"
+    COLORS                    = "colors.txt"
+    COLOR_SEPARATOR           = "="
+    DEFAULT_ACTIVE_COLOR      = "#000000"
+    DEFAULT_INACTIVE_COLOR    = "#9f9f9f"
+    DEFAULT_OFF_COLORS        = "#000000", "#434343"
+    DEFAULT_ON_COLORS         = "#4b79a1", "#283e51"
+    DEFAULT_TEXT_COLOR        = "#ffffff"
+    THEME_NOT_FOUND           = "Theme not found"
+    MISSING_THEME             = "Missing theme folder."
+    MISSING_THEME_FOLDER      = "Themes folder not found.\nOnly the basic theme is available."
+    THEME_FOLDER_NOT_FOUND    = "Themes folder not found"
+    FOLDER                    = os.path.join(__BASE_FOLDER__, "themes")
+    DEFAULT_ICONS_PATH        = os.path.join(FOLDER, DEFAULT, ICONS_FOLDER)
+    DEFAULT_SEARCH_LABEL_PATH = os.path.join(DEFAULT_ICONS_PATH, Constants.SEARCH_LABEL_IMG)
+    DEFAULT_VOLUME_LABEL_PATH = os.path.join(DEFAULT_ICONS_PATH, Constants.VOLUME_LABEL_IMG)
+    CURRENT_THEME_FILE        = os.path.join(FOLDER, CURRENT)
+    DEFAULT_THEME_PATH        = os.path.join(FOLDER, DEFAULT)
--- a/src/download_db_window.ui
+++ b/src/download_db_window.ui
@@ -7,11 +7,11 @@
    <x>0</x>
    <y>0</y>
    <width>400</width>
-    <height>160</height>
+    <height>185</height>
   </rect>
  </property>
  <property name="windowTitle">
-   <string>Download database</string>
+   <string>Downloading</string>
  </property>
  <property name="windowIcon">
   <iconset resource="default_imgs.qrc">
@@ -29,7 +29,7 @@
      </font>
     </property>
     <property name="text">
-      <string>Downloading database
+      <string>Downloading updates
 Please wait...
 </string>
     </property>
@@ -69,7 +69,7 @@ Please wait...
    </widget>
   </item>
   <item>
-    <widget class="QProgressBar" name="progressBar">
+    <widget class="QProgressBar" name="_progress_bar">
     <property name="minimum">
      <number>0</number>
     </property>
--- a/src/download_window.py
+++ b/src/download_window.py
@@ -2,7 +2,8 @@ from PyQt5 import uic
 from PyQt5.QtCore import Qt, pyqtSlot, pyqtSignal
 from PyQt5.QtWidgets import QWidget
 from threads import DownloadThread, ThreadStatus
-from utilities import pop_up, resource_path
+from utilities import pop_up
+from executable_utilities import resource_path
 from constants import Constants, Messages


@@ -12,10 +13,12 @@ Ui_Download_window, _ = uic.loadUiType(


 class DownloadWindow(QWidget, Ui_Download_window):
-    """Subclass QWidget and Ui_Download_window. It is the window displayed during the database download."""
+    """Subclass QWidget and Ui_Download_window. It is the window displayed during
+    downloads and software updates."""

    complete = pyqtSignal()
    closed = pyqtSignal()
+    _PROGRESS_CONEVERSION_FACTOR = 1024

    def __init__(self):
        """Initialize the window."""
@@ -47,10 +50,22 @@ class DownloadWindow(QWidget, Ui_Download_window):
        self._download_thread.speed_progress.connect(self._display_speed)
        self.closed.connect(self._download_thread.set_exit)
        self.cancel_btn.clicked.connect(self._terminate_process)
+        self._size = 0
+        self.target = None

-    def start_download(self):
+    def _prepare_progress_bar(self, size):
+        """Prepare the progress bar for the upcoming download."""
+        self._progress_bar.setMinimum(0)
+        self._progress_bar.setMaximum(size)
+        self._progress_bar.setValue(0)
+
+    def activate(self, target):
        """Start the download thread."""
-        self._download_thread.start()
+        self._size = target.size
+        self.target = target.target
+        self._prepare_progress_bar(target.size)
+        self._download_thread.start(target)
+        self.show()

    def _download_format_str(self, n):
        """Return a well-formatted string with the downloaded MB."""
@@ -77,6 +92,8 @@ class DownloadWindow(QWidget, Ui_Download_window):
            self.status_lbl.setText(self._download_format_str(progress))
        elif progress == Constants.EXTRACTING_CODE:
            self.status_lbl.setText(Constants.EXTRACTING_MSG)
+        if self._size > 0:
+            self._progress_bar.setValue(progress * self._PROGRESS_CONEVERSION_FACTOR)

    def show(self):
        """Extends QWidget.show. Set downloaded MB and speed to zero."""
--- a/src/downloadtargetfactory.py
+++ b/src/downloadtargetfactory.py
@@ -0,0 +1,164 @@
+from contextlib import contextmanager
+from shutil import rmtree
+from os import remove
+import os.path
+import stat
+from constants import (
+    Constants,
+    Database,
+    __BASE_FOLDER__,
+    ThemeConstants,
+    DownloadTarget,
+    SupportedOs,
+)
+from os_utilities import get_os
+from web_utilities import get_folder_hash_code
+
+from zipfile import ZipFile
+from tarfile import TarFile
+
+
+class _ZipExtractor:
+    """Extractor class for zip files.
+
+    Exposes a static method which can be used as a context manager."""
+    @staticmethod
+    @contextmanager
+    def open(fileobj):
+        zipped = ZipFile(fileobj)
+        try:
+            yield zipped
+        finally:
+            zipped.close()
+
+
+class _TarExtractor:
+    """Extractor class for tar files.
+
+    Exposes a static method which can be used as a context manager."""
+    @staticmethod
+    @contextmanager
+    def open(fileobj):
+        tarfile = TarFile.open(fileobj=fileobj)
+        try:
+            yield tarfile
+        finally:
+            tarfile.close()
+
+
+EXTRACTORS = {
+    SupportedOs.WINDOWS: _ZipExtractor,
+    SupportedOs.LINUX: _TarExtractor,
+    # No extractor for MacOs, just download the file through the browser.
+}
+
+
+def _on_rmtree_error(func, path, excinfo):
+    """Function called whenever rmtree fails."""
+    os.chmod(path, stat.S_IWRITE)
+    func(path)
+
+
+def _delete_data_folder():
+    """Delete the Data folder."""
+    if os.path.exists(Constants.DATA_FOLDER):
+        rmtree(Constants.DATA_FOLDER, onerror=_on_rmtree_error)
+
+
+def _delete_updater():
+    """Delete the updater program."""
+    if os.path.exists(Constants.UPDATER_SOFTWARE):
+        remove(Constants.UPDATER_SOFTWARE)
+
+
+def _delete_software():
+    """Delete the main program and the themes folder."""
+    if os.path.exists(Constants.EXECUTABLE_NAME):
+        remove(Constants.EXECUTABLE_NAME)  # Remove Artemis executable.
+    if os.path.exists(ThemeConstants.FOLDER):  # One could not have the theme folder for some reason.
+        rmtree(ThemeConstants.FOLDER, onerror=_on_rmtree_error)
+
+
+class _DataFolderInfo:
+    """Simple class to implement the interface of a 'target' object for the data folder:
+
+    - url;
+    - hash_code;
+    - size."""
+    def __init__(self):
+        self.url = Database.LINK_LOC
+        self.hash_code = get_folder_hash_code()
+        self.size = 0
+
+
+class _BaseDownloadTarget:
+    """Base class for the '_Download*Target' objects.
+
+    Contains all the attributes needed by DownloadWindow and DownloadThread
+    to do the job."""
+    def __init__(self, target, dest_path, target_enum, Extractor, delete_files):
+        self.url = target.url
+        self.hash_code = target.hash_code
+        self.size = target.size
+        self.dest_path = dest_path
+        self.target = target_enum
+        self.Extractor = Extractor
+        self.delete_files = delete_files
+
+
+class _DownloadDataFolderTarget(_BaseDownloadTarget):
+    """Extend _BaseDownloadTarget. Represent the data folder."""
+    def __init__(self, data_folder_info, dest_path=__BASE_FOLDER__):
+        super().__init__(
+            target=data_folder_info,
+            dest_path=dest_path,
+            target_enum=DownloadTarget.DATA_FOLDER,
+            Extractor=_ZipExtractor,
+            delete_files=_delete_data_folder
+        )
+
+
+class _DownloadSoftwareTarget(_BaseDownloadTarget):
+    """Extends _BaseDownloadTarget. Represents the main software."""
+    def __init__(self, software, dest_path=__BASE_FOLDER__):
+        super().__init__(
+            target=software,
+            dest_path=dest_path,
+            target_enum=DownloadTarget.SOFTWARE,
+            Extractor=EXTRACTORS[get_os()],
+            delete_files=_delete_software
+        )
+
+
+class _DownloadUpdaterTarget(_BaseDownloadTarget):
+    """Extends _BaseDownloadTarget. Represents the updater software."""
+    def __init__(self, updater, dest_path=__BASE_FOLDER__):
+        super().__init__(
+            target=updater,
+            dest_path=dest_path,
+            target_enum=DownloadTarget.UPDATER,
+            Extractor=EXTRACTORS[get_os()],
+            delete_files=_delete_updater
+        )
+
+
+def get_download_target(target_type, target=None):
+    """Return a Download*Obj based on the target download.
+
+    These objects expose a common interface:
+    Attributes:
+    - url;
+    - hash_code;
+    - dest_path;
+    - target: an element of the enum DownloadTarget;
+    - Extractor: an object which exposes an 'open(fileobj)' method
+      to extract compressed files;
+    - delete_files: a function to remove the old files."""
+    if target_type is DownloadTarget.DATA_FOLDER:
+        return _DownloadDataFolderTarget(_DataFolderInfo())
+    elif target_type is DownloadTarget.UPDATER and target is not None:
+        return _DownloadUpdaterTarget(target)
+    elif target_type is DownloadTarget.SOFTWARE and target is not None:
+        return _DownloadSoftwareTarget(target)
+    else:
+        raise Exception("ERROR: Invalid download target!")
--- a/src/executable_utilities.py
+++ b/src/executable_utilities.py
@@ -0,0 +1,33 @@
+import sys
+from shutil import which
+import os
+import os.path
+
+
+def _is_executable_version():
+    """Return whether the binary version is running."""
+    return hasattr(sys, "_MEIPASS")
+
+
+IS_BINARY = _is_executable_version()
+
+
+def get_executable_path():
+    """Check whether the executable is in the PATH folder.
+
+    Return the full path or just an ampty string if it is not found
+    in the PATH folder."""
+    path = which("Artemis")
+    if path is not None:
+        return os.path.dirname(path)
+    else:  # Assume that the executable is in the cwd.
+        return os.curdir
+
+
+def resource_path(relative_path):
+    """Get absolute path to resource, works for dev and for PyInstaller."""
+    try:
+        base_path = sys._MEIPASS
+    except Exception:
+        base_path = os.path.abspath(".")
+    return os.path.join(base_path, relative_path)
--- a/src/filters.py
+++ b/src/filters.py
@@ -0,0 +1,847 @@
+"""This module contains all the filter-related classes and functions.
+
+The only class exposed is Filters which provides the following methods:
+- ok(signal_name): to check if all the filters are passed;
+- reset(): to reset all the applied filters;
+- refresh(): used when the theme is changed."""
+
+from functools import partial
+import webbrowser
+from PyQt5.QtWidgets import QListWidgetItem, QTreeWidgetItem
+from PyQt5.QtCore import pyqtSlot, QObject
+from constants import (
+    Constants,
+    Ftype,
+    Signal,
+)
+from utilities import (
+    uncheck_and_emit,
+    connect_events_to_func,
+    filters_limit,
+    is_undef_freq,
+    is_undef_band,
+    safe_cast,
+    show_matching_strings,
+    get_field_entries,
+)
+
+
+class _BaseFilter(QObject):
+    """Base class for all filters."""
+
+    def __init__(self, owner):
+        """Positional argument:
+        owner - the object containing the filter screen."""
+        super().__init__()
+        self._owner = owner
+
+    def refresh(self):
+        """Refresh the screen."""
+        pass
+
+
+class _FreqBandMixIn:
+    """Mixin class for the frequency and band filters.
+
+    Provides some functions used in both classes."""
+
+    @pyqtSlot()
+    def _set_min_value_upper_limit(self, lower_combo_box,
+                                   lower_spin_box,
+                                   upper_combo_box,
+                                   upper_spin_box):
+        """Forbid to a lower limit to be greater than the corresponding upper one.
+
+        Used for frequency and bandwidth screens."""
+        if lower_spin_box.isEnabled():
+            unit_conversion = {
+                'Hz': ['kHz', 'MHz', 'GHz'],
+                'kHz': ['MHz', 'GHz'],
+                'MHz': ['GHz']
+            }
+            lower_units = lower_combo_box.currentText()
+            upper_units = upper_combo_box.currentText()
+            lower_value = lower_spin_box.value()
+            inf_limit = (lower_value * Constants.CONVERSION_FACTORS[lower_units]) \
+                // Constants.CONVERSION_FACTORS[upper_units]
+            counter = 0
+            while inf_limit > upper_spin_box.maximum():
+                counter += 1
+                inf_limit //= 1000
+            if upper_spin_box.minimum() != inf_limit:
+                upper_spin_box.setMinimum(inf_limit)
+            if counter > 0:
+                new_unit = unit_conversion[upper_units][counter - 1]
+                upper_combo_box.disconnect()
+                upper_combo_box.setCurrentText(new_unit)
+                upper_combo_box.currentTextChanged.connect(
+                    partial(
+                        self._set_min_value_upper_limit,
+                        lower_combo_box,
+                        lower_spin_box,
+                        upper_combo_box,
+                        upper_spin_box
+                    )
+                )
+
+    @pyqtSlot()
+    def _reset_fb_filters(self, ftype):
+        """Reset the Frequency or Bandwidth depending on 'ftype'.
+
+        ftype can be either Ftype.FREQ or Ftype.BAND.
+        """
+        if ftype != Ftype.FREQ and ftype != Ftype.BAND:
+            raise ValueError("Wrong ftype in function '_reset_fb_filters'")
+
+        apply_remove_btn  = getattr(self._owner, 'apply_remove_'  + ftype + '_filter_btn')
+        include_undef_btn = getattr(self._owner, 'include_undef_' + ftype + 's')
+        activate_low      = getattr(self._owner, 'activate_low_'  + ftype + '_filter_btn')
+        activate_up       = getattr(self._owner, 'activate_up_'   + ftype + '_filter_btn')
+        lower_unit        = getattr(self._owner, 'lower_'         + ftype + '_filter_unit')
+        upper_unit        = getattr(self._owner, 'upper_'         + ftype + '_filter_unit')
+        lower_spinbox     = getattr(self._owner, 'lower_'         + ftype + '_spinbox')
+        upper_spinbox     = getattr(self._owner, 'upper_'         + ftype + '_spinbox')
+        lower_confidence  = getattr(self._owner, 'lower_'         + ftype + '_confidence')
+        upper_confidence  = getattr(self._owner, 'lower_'         + ftype + '_confidence')
+
+        default_val = 1 if ftype == Ftype.FREQ else 5000
+        if ftype == Ftype.FREQ:
+            for f in self._frequency_filters_btns:
+                if f.isChecked():
+                    f.setChecked(False)
+        uncheck_and_emit(apply_remove_btn)
+        if include_undef_btn.isChecked():
+            include_undef_btn.setChecked(False)
+        uncheck_and_emit(activate_low)
+        uncheck_and_emit(activate_up)
+        lower_unit.setCurrentText("MHz")
+        upper_unit.setCurrentText("MHz")
+        lower_spinbox.setValue(default_val)
+        upper_spinbox.setMinimum(1)
+        upper_spinbox.setValue(default_val)
+        lower_confidence.setValue(0)
+        upper_confidence.setValue(0)
+
+    @pyqtSlot()
+    def _set_band_filter_label(self,
+                               activate_low_btn,
+                               lower_spinbox,
+                               lower_unit,
+                               lower_confidence,
+                               activate_up_btn,
+                               upper_spinbox,
+                               upper_unit,
+                               upper_confidence,
+                               range_lbl):
+        """Display the actual range applied for the signal's property search.
+
+        Used for frequency and bandwidth screens."""
+        activate_low = False
+        activate_high = False
+        color = self._owner.inactive_color
+        title = ''
+        to_display = ''
+        if activate_low_btn.isChecked():
+            activate_low = True
+            color = self._owner.active_color
+            min_value = lower_spinbox.value()
+            if lower_confidence.value() != 0:
+                min_value -= lower_spinbox.value() * lower_confidence.value() / 100
+            to_display += str(round(min_value, Constants.MAX_DIGITS)) \
+                + ' ' + lower_unit.currentText()
+        else:
+            to_display += 'DC'
+        to_display += Constants.RANGE_SEPARATOR
+        if activate_up_btn.isChecked():
+            max_value = upper_spinbox.value()
+            activate_high = True
+            color = self._owner.active_color
+            if upper_confidence.value() != 0:
+                max_value += upper_spinbox.value() * upper_confidence.value() / 100
+            to_display += str(round(max_value, Constants.MAX_DIGITS)) + ' ' \
+                + upper_unit.currentText()
+        else:
+            to_display += 'INF'
+        if activate_low and activate_high:
+            title = 'Band-pass\n\n'
+        elif activate_low and not activate_high:
+            title = 'Low-pass\n\n'
+        elif not activate_low and activate_high:
+            title = 'High-pass\n\n'
+        else:
+            title = "Selected range:\n\n"
+            to_display = "Inactive"
+        to_display = title + to_display
+        range_lbl.setText(to_display)
+        range_lbl.setStyleSheet(f'color: {color};')
+
+
+class FreqFilter(_BaseFilter, _FreqBandMixIn):
+    """Frequency filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_freq_filter_btn
+        self.reset_btn = self._owner.reset_frequency_filters_btn
+        self._frequency_filters_btns = (
+            self._owner.elf_filter_btn,
+            self._owner.slf_filter_btn,
+            self._owner.ulf_filter_btn,
+            self._owner.vlf_filter_btn,
+            self._owner.lf_filter_btn,
+            self._owner.mf_filter_btn,
+            self._owner.hf_filter_btn,
+            self._owner.vhf_filter_btn,
+            self._owner.uhf_filter_btn,
+            self._owner.shf_filter_btn,
+            self._owner.ehf_filter_btn,
+        )
+
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                *self._frequency_filters_btns,
+                self._owner.include_undef_freqs,
+                self._owner.activate_low_freq_filter_btn,
+                self._owner.activate_up_freq_filter_btn
+            ],
+            radio_1=self._owner.activate_low_freq_filter_btn,
+            ruled_by_radio_1=[
+                self._owner.lower_freq_spinbox,
+                self._owner.lower_freq_filter_unit,
+                self._owner.lower_freq_confidence
+            ],
+            radio_2=self._owner.activate_up_freq_filter_btn,
+            ruled_by_radio_2=[
+                self._owner.upper_freq_spinbox,
+                self._owner.upper_freq_filter_unit,
+                self._owner.upper_freq_confidence
+            ]
+        )
+
+        connect_events_to_func(
+            events_to_connect=[self._owner.lower_freq_spinbox.valueChanged,
+                               self._owner.upper_freq_spinbox.valueChanged,
+                               self._owner.lower_freq_filter_unit.currentTextChanged,
+                               self._owner.upper_freq_filter_unit.currentTextChanged,
+                               self._owner.activate_low_freq_filter_btn.toggled],
+            fun_to_connect=self._set_min_value_upper_limit,
+            fun_args=[self._owner.lower_freq_filter_unit,
+                      self._owner.lower_freq_spinbox,
+                      self._owner.upper_freq_filter_unit,
+                      self._owner.upper_freq_spinbox]
+        )
+
+        connect_events_to_func(
+            events_to_connect=[self._owner.lower_freq_spinbox.valueChanged,
+                               self._owner.upper_freq_spinbox.valueChanged,
+                               self._owner.lower_freq_filter_unit.currentTextChanged,
+                               self._owner.upper_freq_filter_unit.currentTextChanged,
+                               self._owner.activate_low_freq_filter_btn.clicked,
+                               self._owner.activate_up_freq_filter_btn.clicked,
+                               self._owner.lower_freq_confidence.valueChanged,
+                               self._owner.upper_freq_confidence.valueChanged],
+            fun_to_connect=self._set_band_filter_label,
+            fun_args=[self._owner.activate_low_freq_filter_btn,
+                      self._owner.lower_freq_spinbox,
+                      self._owner.lower_freq_filter_unit,
+                      self._owner.lower_freq_confidence,
+                      self._owner.activate_up_freq_filter_btn,
+                      self._owner.upper_freq_spinbox,
+                      self._owner.upper_freq_filter_unit,
+                      self._owner.upper_freq_confidence,
+                      self._owner.freq_range_lbl]
+        )
+
+        self._owner.activate_low_freq_filter_btn.toggled.connect(
+            partial(self._owner.activate_if_toggled,
+                    self._owner.activate_low_freq_filter_btn,
+                    self._owner.lower_freq_spinbox,
+                    self._owner.lower_freq_filter_unit,
+                    self._owner.lower_freq_confidence)
+        )
+
+        self._owner.activate_up_freq_filter_btn.toggled.connect(
+            partial(self._owner.activate_if_toggled,
+                    self._owner.activate_up_freq_filter_btn,
+                    self._owner.upper_freq_spinbox,
+                    self._owner.upper_freq_filter_unit,
+                    self._owner.upper_freq_confidence)
+        )
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the filter screen."""
+        self._reset_fb_filters(Ftype.FREQ)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the frequency filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        undef_freq = is_undef_freq(self._owner.db.loc[signal_name])
+        if undef_freq:
+            if self._owner.include_undef_freqs.isChecked():
+                return True
+            else:
+                return False
+
+        signal_freqs = (
+            safe_cast(self._owner.db.at[signal_name, Signal.INF_FREQ], int),
+            safe_cast(self._owner.db.at[signal_name, Signal.SUP_FREQ], int)
+        )
+
+        band_filter_ok = False
+        any_checked = False
+        for btn, band_limits in zip(self._frequency_filters_btns, Constants.BANDS):
+            if btn.isChecked():
+                any_checked = True
+                if signal_freqs[0] < band_limits.upper and signal_freqs[1] >= band_limits.lower:
+                    band_filter_ok = True
+        lower_limit_ok = True
+        upper_limit_ok = True
+        if self._owner.activate_low_freq_filter_btn.isChecked():
+            if not signal_freqs[1] >= filters_limit(self._owner.lower_freq_spinbox,
+                                                    self._owner.lower_freq_filter_unit,
+                                                    self._owner.lower_freq_confidence, -1):
+                lower_limit_ok = False
+        if self._owner.activate_up_freq_filter_btn.isChecked():
+            if not signal_freqs[0] < filters_limit(self._owner.upper_freq_spinbox,
+                                                   self._owner.upper_freq_filter_unit,
+                                                   self._owner.upper_freq_confidence):
+                upper_limit_ok = False
+        if any_checked:
+            return band_filter_ok and lower_limit_ok and upper_limit_ok
+        else:
+            return lower_limit_ok and upper_limit_ok
+
+    def refresh(self):
+        """Extend _BaseFilter.refresh."""
+        super().refresh()
+        self._set_band_filter_label(
+            self._owner.activate_low_band_filter_btn,
+            self._owner.lower_band_spinbox,
+            self._owner.lower_band_filter_unit,
+            self._owner.lower_band_confidence,
+            self._owner.activate_up_band_filter_btn,
+            self._owner.upper_band_spinbox,
+            self._owner.upper_band_filter_unit,
+            self._owner.upper_band_confidence,
+            self._owner.band_range_lbl
+        )
+
+
+class BandFilter(_BaseFilter, _FreqBandMixIn):
+    """Band filter class."""
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_band_filter_btn
+        self.reset_btn = self._owner.reset_band_filters_btn
+        connect_events_to_func(
+            events_to_connect=[self._owner.lower_band_spinbox.valueChanged,
+                               self._owner.upper_band_spinbox.valueChanged,
+                               self._owner.lower_band_filter_unit.currentTextChanged,
+                               self._owner.upper_band_filter_unit.currentTextChanged,
+                               self._owner.activate_low_band_filter_btn.toggled],
+            fun_to_connect=self._set_min_value_upper_limit,
+            fun_args=[self._owner.lower_band_filter_unit,
+                      self._owner.lower_band_spinbox,
+                      self._owner.upper_band_filter_unit,
+                      self._owner.upper_band_spinbox]
+        )
+
+        connect_events_to_func(
+            events_to_connect=[self._owner.lower_band_spinbox.valueChanged,
+                               self._owner.upper_band_spinbox.valueChanged,
+                               self._owner.lower_band_filter_unit.currentTextChanged,
+                               self._owner.upper_band_filter_unit.currentTextChanged,
+                               self._owner.activate_low_band_filter_btn.clicked,
+                               self._owner.activate_up_band_filter_btn.clicked,
+                               self._owner.lower_band_confidence.valueChanged,
+                               self._owner.upper_band_confidence.valueChanged],
+            fun_to_connect=self._set_band_filter_label,
+            fun_args=[self._owner.activate_low_band_filter_btn,
+                      self._owner.lower_band_spinbox,
+                      self._owner.lower_band_filter_unit,
+                      self._owner.lower_band_confidence,
+                      self._owner.activate_up_band_filter_btn,
+                      self._owner.upper_band_spinbox,
+                      self._owner.upper_band_filter_unit,
+                      self._owner.upper_band_confidence,
+                      self._owner.band_range_lbl]
+        )
+
+        self._owner.activate_low_band_filter_btn.toggled.connect(
+            partial(self._owner.activate_if_toggled,
+                    self._owner.activate_low_band_filter_btn,
+                    self._owner.lower_band_spinbox,
+                    self._owner.lower_band_filter_unit,
+                    self._owner.lower_band_confidence)
+        )
+
+        self._owner.activate_up_band_filter_btn.toggled.connect(
+            partial(self._owner.activate_if_toggled,
+                    self._owner.activate_up_band_filter_btn,
+                    self._owner.upper_band_spinbox,
+                    self._owner.upper_band_filter_unit,
+                    self._owner.upper_band_confidence)
+        )
+
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                self._owner.include_undef_bands,
+                self._owner.activate_low_band_filter_btn,
+                self._owner.activate_up_band_filter_btn
+            ],
+            radio_1=self._owner.activate_low_band_filter_btn,
+            ruled_by_radio_1=[
+                self._owner.lower_band_spinbox,
+                self._owner.lower_band_filter_unit,
+                self._owner.lower_band_confidence
+            ],
+            radio_2=self._owner.activate_up_band_filter_btn,
+            ruled_by_radio_2=[
+                self._owner.upper_band_spinbox,
+                self._owner.upper_band_filter_unit,
+                self._owner.upper_band_confidence
+            ]
+        )
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the filter screen."""
+        self._reset_fb_filters(Ftype.BAND)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the band filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        undef_band = is_undef_band(self._owner.db.loc[signal_name])
+        if undef_band:
+            if self._owner.include_undef_bands.isChecked():
+                return True
+            else:
+                return False
+
+        signal_bands = (
+            safe_cast(self._owner.db.at[signal_name, Signal.INF_BAND], int),
+            safe_cast(self._owner.db.at[signal_name, Signal.SUP_BAND], int)
+        )
+
+        lower_limit_ok = True
+        upper_limit_ok = True
+        if self._owner.activate_low_band_filter_btn.isChecked():
+            if not signal_bands[1] >= filters_limit(self._owner.lower_band_spinbox,
+                                                    self._owner.lower_band_filter_unit,
+                                                    self._owner.lower_band_confidence, -1):
+                lower_limit_ok = False
+        if self._owner.activate_up_band_filter_btn.isChecked():
+            if not signal_bands[0] < filters_limit(self._owner.upper_band_spinbox,
+                                                   self._owner.upper_band_filter_unit,
+                                                   self._owner.upper_band_confidence):
+                upper_limit_ok = False
+        return lower_limit_ok and upper_limit_ok
+
+    def refresh(self):
+        """Extend _BaseFilter.refresh."""
+        super().refresh()
+        self._set_band_filter_label(
+            self._owner.activate_low_freq_filter_btn,
+            self._owner.lower_freq_spinbox,
+            self._owner.lower_freq_filter_unit,
+            self._owner.lower_freq_confidence,
+            self._owner.activate_up_freq_filter_btn,
+            self._owner.upper_freq_spinbox,
+            self._owner.upper_freq_filter_unit,
+            self._owner.upper_freq_confidence,
+            self._owner.freq_range_lbl
+        )
+
+
+class CatFilter(_BaseFilter):
+    """Category filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_cat_filter_btn
+        self.reset_btn = self._owner.reset_cat_filters_btn
+        # Order matters!
+        self._cat_filter_btns = [
+            self._owner.military_btn,
+            self._owner.radar_btn,
+            self._owner.active_btn,
+            self._owner.inactive_btn,
+            self._owner.ham_btn,
+            self._owner.commercial_btn,
+            self._owner.aviation_btn,
+            self._owner.marine_btn,
+            self._owner.analogue_btn,
+            self._owner.digital_btn,
+            self._owner.trunked_btn,
+            self._owner.utility_btn,
+            self._owner.sat_btn,
+            self._owner.navigation_btn,
+            self._owner.interfering_btn,
+            self._owner.number_stations_btn,
+            self._owner.time_signal_btn
+        ]
+
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                *self._cat_filter_btns,
+                self._owner.cat_at_least_one,
+                self._owner.cat_all
+            ]
+        )
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the category filter screen."""
+        uncheck_and_emit(self.apply_remove_btn)
+        for f in self._cat_filter_btns:
+            if f.isChecked():
+                f.setChecked(False)
+        self._owner.cat_at_least_one.setChecked(True)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the category filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        cat_code = self._owner.db.at[signal_name, Signal.CATEGORY_CODE]
+        cat_checked = 0
+        positive_cases = 0
+        for index, cat in enumerate(self._cat_filter_btns):
+            if cat.isChecked():
+                cat_checked += 1
+                if cat_code[index] == '1':
+                    positive_cases += 1
+        if self._owner.cat_at_least_one.isChecked():
+            return positive_cases > 0
+        else:
+            return cat_checked == positive_cases and cat_checked > 0
+
+
+class ModeFilter(_BaseFilter):
+    """Mode filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_mode_filter_btn
+        self.reset_btn = self._owner.reset_mode_filters_btn
+        self._set_mode_tree_widget()
+        self._owner.mode_tree_widget.itemSelectionChanged.connect(
+            self._manage_mode_selections
+        )
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                self._owner.mode_tree_widget,
+                self._owner.include_unknown_modes_btn
+            ]
+        )
+
+    def _manage_mode_selections(self):
+        """Rules the selection of childs items of the 'Mode' QTreeWidget.
+
+        If a parent is selected all its children will be selected as well.
+        """
+        selected_items = self._owner.mode_tree_widget.selectedItems()
+        parents = Constants.MODES.keys()
+        for parent in parents:
+            for item in selected_items:
+                if parent == item.text(0):
+                    for i in range(len(Constants.MODES[parent])):
+                        item.child(i).setSelected(True)
+
+    def _set_mode_tree_widget(self):
+        """Construct the QTreeWidget for the 'Mode' screen."""
+        for parent, children in Constants.MODES.items():
+            iparent = QTreeWidgetItem([parent])
+            self._owner.mode_tree_widget.addTopLevelItem(iparent)
+            for child in children:
+                ichild = QTreeWidgetItem([child])
+                iparent.addChild(ichild)
+        self._owner.mode_tree_widget.expandAll()
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the mode filter screen."""
+        uncheck_and_emit(self.apply_remove_btn)
+        parents = Constants.MODES.keys()
+        selected_children = []
+        for item in self._owner.mode_tree_widget.selectedItems():
+            if item.text(0) in parents:
+                item.setSelected(False)
+            else:
+                selected_children.append(item)
+        for children in selected_children:
+            children.setSelected(False)
+        if self._owner.include_unknown_modes_btn.isChecked():
+            self._owner.include_unknown_modes_btn.setChecked(False)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the mode filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        signal_mode = self._owner.db.at[signal_name, Signal.MODE]
+        if signal_mode == Constants.UNKNOWN:
+            if self._owner.include_unknown_modes_btn.isChecked():
+                return True
+            else:
+                return False
+        selected_items = [item for item in self._owner.mode_tree_widget.selectedItems()]
+        selected_items_text = [i.text(0) for i in selected_items]
+        parents = [
+            item for item in selected_items_text
+            if item in Constants.MODES.keys()
+        ]
+        ok = []
+        for item in selected_items:
+            if item.text(0) in parents:
+                ok.append(item.text(0) in signal_mode)
+            elif not item.parent().isSelected():
+                ok.append(item.text(0) == signal_mode)
+        return any(ok)
+
+
+class ModulationFilter(_BaseFilter):
+    """Modulation filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_modulation_filter_btn
+        self.reset_btn = self._owner.reset_modulation_filters_btn
+        self._owner.search_bar_modulation.textEdited.connect(self._show_matching_modulations)
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                self._owner.search_bar_modulation,
+                self._owner.modulation_list
+            ]
+        )
+        self._owner.modulation_list.itemClicked.connect(self._remove_if_unselected_modulation)
+
+    @pyqtSlot(QListWidgetItem)
+    def _remove_if_unselected_modulation(self, item):
+        """If an item is unselected from the modulations list, hide the item."""
+        if not item.isSelected():
+            self._show_matching_modulations(self.search_bar_modulation.text())
+
+    @pyqtSlot(str)
+    def _show_matching_modulations(self, text):
+        """Show the modulations which matches 'text'.
+
+        The match criterion is defined in 'show_matching_strings'."""
+        show_matching_strings(self._owner.modulation_list, text)
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the modulation filter screen."""
+        uncheck_and_emit(self.apply_remove_btn)
+        self._owner.search_bar_modulation.setText('')
+        show_matching_strings(
+            self._owner.modulation_list,
+            self._owner.search_bar_modulation.text()
+        )
+        for i in range(self._owner.modulation_list.count()):
+            if self._owner.modulation_list.item(i).isSelected():
+                self._owner.modulation_list.item(i).setSelected(False)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the modulation filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        signal_modulation = get_field_entries(
+            self._owner.db.at[signal_name, Signal.MODULATION]
+        )
+        for item in self._owner.modulation_list.selectedItems():
+            if item.text() in signal_modulation:
+                return True
+        return False
+
+
+class LocFilter(_BaseFilter):
+    """Location filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_location_filter_btn
+        self.reset_btn = self._owner.reset_location_filters_btn
+        self._owner.search_bar_location.textEdited.connect(
+            self._show_matching_locations
+        )
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                self._owner.search_bar_location,
+                self._owner.locations_list
+            ]
+        )
+        self._owner.locations_list.itemClicked.connect(self._remove_if_unselected_location)
+
+    @pyqtSlot(str)
+    def _show_matching_locations(self, text):
+        """Show the locations which matches 'text'.
+
+        The match criterion is defined in 'show_matching_strings'."""
+        show_matching_strings(self._owner.locations_list, text)
+
+    @pyqtSlot(QListWidgetItem)
+    def _remove_if_unselected_location(self, item):
+        """If an item is unselected from the locations list, hide the item."""
+        if not item.isSelected():
+            self._show_matching_locations(self._owner.search_bar_location.text())
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the location filter screen."""
+        uncheck_and_emit(self.apply_remove_btn)
+        self._owner.search_bar_location.setText('')
+        show_matching_strings(
+            self._owner.locations_list,
+            self._owner.search_bar_location.text()
+        )
+        for i in range(self._owner.locations_list.count()):
+            if self._owner.locations_list.item(i).isSelected():
+                self._owner.locations_list.item(i).setSelected(False)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the location filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        signal_locations = get_field_entries(
+            self._owner.db.at[signal_name, Signal.LOCATION]
+        )
+        for item in self._owner.locations_list.selectedItems():
+            if item.text() in signal_locations:
+                return True
+        return False
+
+
+class ACFFilter(_BaseFilter):
+    """Autocorrelation function filter class."""
+
+    def __init__(self, owner):
+        super().__init__(owner)
+        self.apply_remove_btn = self._owner.apply_remove_acf_filter_btn
+        self.reset_btn = self._owner.reset_acf_filters_btn
+        self.apply_remove_btn.set_texts(Constants.APPLY, Constants.REMOVE)
+        self.apply_remove_btn.set_slave_filters(
+            simple_ones=[
+                self._owner.include_undef_acf,
+                self._owner.include_variable_acf,
+                self._owner.acf_spinbox,
+                self._owner.acf_confidence
+            ]
+        )
+        self._owner.acf_info_btn.clicked.connect(lambda: webbrowser.open(Constants.ACF_DOCS))
+
+        connect_events_to_func(
+            events_to_connect=[self._owner.acf_spinbox.valueChanged,
+                               self._owner.acf_confidence.valueChanged],
+            fun_to_connect=self._set_acf_interval_label,
+            fun_args=None
+        )
+
+    @pyqtSlot()
+    def _set_acf_interval_label(self):
+        """Display the actual acf interval for the search."""
+        tolerance = self._owner.acf_spinbox.value() * self._owner.acf_confidence.value() / 100
+        if tolerance > 0:
+            val = round(self._owner.acf_spinbox.value() - tolerance, Constants.MAX_DIGITS)
+            to_display = f"Selected range:\n\n{val}" + Constants.RANGE_SEPARATOR \
+                + f"{round(self._owner.acf_spinbox.value() + tolerance, Constants.MAX_DIGITS)} ms"
+        else:
+            to_display = f"Selected value:\n\n{self._owner.acf_spinbox.value()} ms"
+        self._owner.acf_range_lbl.setText(to_display)
+        self._owner.acf_range_lbl.setStyleSheet(f"color: {self._owner.active_color}")
+
+    @pyqtSlot()
+    def reset(self):
+        """Reset the acf filter screen."""
+        uncheck_and_emit(self.apply_remove_btn)
+        if self._owner.include_undef_acf.isChecked():
+            self._owner.include_undef_acf.setChecked(False)
+        if self._owner.include_variable_acf.isChecked():
+            self._owner.include_variable_acf.setChecked(False)
+        self._owner.acf_spinbox.setValue(50)
+        self._owner.acf_confidence.setValue(0)
+
+    def _ok(self, signal_name):
+        """Evalaute if the signal matches the acf filters."""
+        if not self.apply_remove_btn.isChecked():
+            return True
+        signal_acf_list = self._owner.db.at[signal_name, Signal.ACF]
+        if signal_acf_list[0].unknown:  # Unknown acf are the only acf of the signal.
+            if self._owner.include_undef_acf.isChecked():
+                return True
+            else:
+                return False
+        else:
+            tolerance = self._owner.acf_spinbox.value() * self._owner.acf_confidence.value() / 100
+            upper_limit = self._owner.acf_spinbox.value() + tolerance
+            lower_limit = self._owner.acf_spinbox.value() - tolerance
+            for v in signal_acf_list:
+                if v.is_numeric:
+                    if lower_limit <= v.numeric_value <= upper_limit:
+                        return True
+                elif self._owner.include_variable_acf.isChecked():
+                    return True
+            return False
+
+    def refresh(self):
+        """Extend _BaseFilter.refresh."""
+        super().refresh()
+        self._set_acf_interval_label()
+
+
+class Filters(QObject):
+    """Global filter class.
+
+    Provides the information about all the filters. Its only public attribute
+    is filters, which is a dictionary containing instances of all the filters.
+    The only exposed methods are reset(), ok(signal_name) and refresh().
+    The class also connects the apply and reset buttons to the relevant functions."""
+
+    def __init__(self, owner):
+        super().__init__()
+        self.filters = {
+            "freq_filter": FreqFilter(owner),
+            "band_filter": BandFilter(owner),
+            "cat_filter": CatFilter(owner),
+            "mode_filter": ModeFilter(owner),
+            "modulation_filter": ModulationFilter(owner),
+            "location_filter": LocFilter(owner),
+            "acf_filter": ACFFilter(owner),
+        }
+        self._owner = owner
+        self._owner.reset_filters_btn.clicked.connect(self._reset)
+
+        # Connect Apply and Reset buttons clicks to functions.
+        for f in self._values:
+            f.apply_remove_btn.clicked.connect(self._display_signals)
+            f.reset_btn.clicked.connect(f.reset)
+
+    @property
+    def _values(self):
+        return self.filters.values()
+
+    @pyqtSlot()
+    def _display_signals(self):
+        self._owner.display_signals()
+
+    @pyqtSlot()
+    def _reset(self):
+        """Reset all the filters."""
+        for f in self._values:
+            f.reset()
+
+    def ok(self, signal_name):
+        """Check whether all the filters are passed."""
+        return all(f._ok(signal_name) for f in self._values)
+
+    def refresh(self):
+        """Refresh the relevant widgets when changing theme."""
+        for f in self._values:
+            f.refresh()
--- a/src/os_utilities.py
+++ b/src/os_utilities.py
@@ -0,0 +1,34 @@
+import sys
+from constants import SupportedOs
+
+
+def _is_mac_os():
+    """Return True if running OS is Mac."""
+    return sys.platform == 'darwin'
+
+
+def _is_win_os():
+    """Return True if running OS is Windows."""
+    return sys.platform == 'win32'
+
+
+def _is_linux_os():
+    """Return True if running OS is Linux."""
+    return sys.platform == 'linux'
+
+
+IS_MAC = _is_mac_os()
+IS_LINUX = _is_linux_os()
+IS_WINDOWS = _is_win_os()
+
+
+def get_os():
+    """Get the name of the current running operating system."""
+    if IS_WINDOWS:
+        return SupportedOs.WINDOWS
+    elif IS_LINUX:
+        return SupportedOs.LINUX
+    elif IS_MAC:
+        return SupportedOs.MAC
+    else:
+        raise Exception("ERROR: OS not recognized.")
--- a/src/spaceweathermanager.py
+++ b/src/spaceweathermanager.py
@@ -0,0 +1,297 @@
+import webbrowser
+from PyQt5.QtCore import QObject, pyqtSlot
+from constants import Constants, Messages
+from switchable_label import SwitchableLabelsIterable
+from weatherdata import SpaceWeatherData
+from utilities import safe_cast, pop_up
+
+
+class SpaceWeatherManager(QObject):
+    """Class to manage the spaceweather screen."""
+
+    def __init__(self, owner):
+        super().__init__()
+        self._owner = owner
+        self._owner.info_now_btn.clicked.connect(
+            lambda: webbrowser.open(Constants.SPACE_WEATHER_INFO)
+        )
+        self._owner.update_now_bar.clicked.connect(self._start_update_space_weather)
+        self._owner.update_now_bar.set_idle()
+        self._owner.space_weather_data = SpaceWeatherData()
+        self._owner.space_weather_data.update_complete.connect(self._update_space_weather)
+
+        self.space_weather_labels = (
+            self._owner.space_weather_lbl_0,
+            self._owner.space_weather_lbl_1,
+            self._owner.space_weather_lbl_2,
+            self._owner.space_weather_lbl_3,
+            self._owner.space_weather_lbl_4,
+            self._owner.space_weather_lbl_5,
+            self._owner.space_weather_lbl_6,
+            self._owner.space_weather_lbl_7,
+            self._owner.space_weather_lbl_8
+        )
+
+        for lab in self.space_weather_labels:
+            lab.set_default_stylesheet()
+
+        self._owner.space_weather_label_container.labels = self.space_weather_labels
+        self._owner.space_weather_label_name_container.labels = [
+            self._owner.eme_lbl,
+            self._owner.ms_lbl,
+            self._owner.muf_lbl,
+            self._owner.hi_lbl,
+            self._owner.eu50_lbl,
+            self._owner.eu70_lbl,
+            self._owner.eu144_lbl,
+            self._owner.na_lbl,
+            self._owner.aurora_lbl
+        ]
+
+        self._switchable_r_labels = SwitchableLabelsIterable(
+            self._owner.r0_now_lbl,
+            self._owner.r1_now_lbl,
+            self._owner.r2_now_lbl,
+            self._owner.r3_now_lbl,
+            self._owner.r4_now_lbl,
+            self._owner.r5_now_lbl
+        )
+
+        self._switchable_s_labels = SwitchableLabelsIterable(
+            self._owner.s0_now_lbl,
+            self._owner.s1_now_lbl,
+            self._owner.s2_now_lbl,
+            self._owner.s3_now_lbl,
+            self._owner.s4_now_lbl,
+            self._owner.s5_now_lbl
+        )
+
+        self._switchable_g_now_labels = SwitchableLabelsIterable(
+            self._owner.g0_now_lbl,
+            self._owner.g1_now_lbl,
+            self._owner.g2_now_lbl,
+            self._owner.g3_now_lbl,
+            self._owner.g4_now_lbl,
+            self._owner.g5_now_lbl
+        )
+
+        self._switchable_g_today_labels = SwitchableLabelsIterable(
+            self._owner.g0_today_lbl,
+            self._owner.g1_today_lbl,
+            self._owner.g2_today_lbl,
+            self._owner.g3_today_lbl,
+            self._owner.g4_today_lbl,
+            self._owner.g5_today_lbl
+        )
+
+        self._k_storm_labels = SwitchableLabelsIterable(
+            self._owner.k_ex_sev_storm_lbl,
+            self._owner.k_very_sev_storm_lbl,
+            self._owner.k_sev_storm_lbl,
+            self._owner.k_maj_storm_lbl,
+            self._owner.k_min_storm_lbl,
+            self._owner.k_active_lbl,
+            self._owner.k_unsettled_lbl,
+            self._owner.k_quiet_lbl,
+            self._owner.k_very_quiet_lbl,
+            self._owner.k_inactive_lbl
+        )
+
+        self._a_storm_labels = SwitchableLabelsIterable(
+            self._owner.a_sev_storm_lbl,
+            self._owner.a_maj_storm_lbl,
+            self._owner.a_min_storm_lbl,
+            self._owner.a_active_lbl,
+            self._owner.a_unsettled_lbl,
+            self._owner.a_quiet_lbl
+        )
+
+        # Used by ThemeManager.
+        self.refreshable_labels = SwitchableLabelsIterable(
+            *self._switchable_r_labels,
+            *self._switchable_s_labels,
+            *self._switchable_g_now_labels,
+            *self._switchable_g_today_labels,
+            *self._k_storm_labels,
+            *self._a_storm_labels,
+            self._owner.expected_noise_lbl
+        )
+
+    @pyqtSlot()
+    def _start_update_space_weather(self):
+        """Start the update of the space weather screen.
+
+        Start the corresponding thread.
+        """
+        if not self._owner.space_weather_data.is_updating:
+            self._owner.update_now_bar.set_updating()
+            self._owner.space_weather_data.update()
+
+    @pyqtSlot(bool)
+    def _update_space_weather(self, status_ok):
+        """Update the space weather screen after a successful download.
+
+        If the download was not successful throw a warning. In any case remove
+        the downloaded data.
+        """
+        self._owner.update_now_bar.set_idle()
+        if status_ok:
+            xray_long = safe_cast(self._owner.space_weather_data.xray[-1][7], float)
+
+            def format_text(letter, power):
+                return letter + f"{xray_long * 10**power:.1f}"
+
+            if xray_long < 1e-8 and xray_long != -1.00e+05:
+                self._owner.peak_flux_lbl.setText(format_text("<A", 8))
+            elif xray_long >= 1e-8 and xray_long < 1e-7:
+                self._owner.peak_flux_lbl.setText(format_text("A", 8))
+            elif xray_long >= 1e-7 and xray_long < 1e-6:
+                self._owner.peak_flux_lbl.setText(format_text("B", 7))
+            elif xray_long >= 1e-6 and xray_long < 1e-5:
+                self._owner.peak_flux_lbl.setText(format_text("C", 6))
+            elif xray_long >= 1e-5 and xray_long < 1e-4:
+                self._owner.peak_flux_lbl.setText(format_text("M", 5))
+            elif xray_long >= 1e-4:
+                self._owner.peak_flux_lbl.setText(format_text("X", 4))
+            elif xray_long == -1.00e+05:
+                self._owner.peak_flux_lbl.setText("No Data")
+
+            if xray_long < 1e-5 and xray_long != -1.00e+05:
+                self._switchable_r_labels.switch_on(self._owner.r0_now_lbl)
+            elif xray_long >= 1e-5 and xray_long < 5e-5:
+                self._switchable_r_labels.switch_on(self._owner.r1_now_lbl)
+            elif xray_long >= 5e-5 and xray_long < 1e-4:
+                self._switchable_r_labels.switch_on(self._owner.r2_now_lbl)
+            elif xray_long >= 1e-4 and xray_long < 1e-3:
+                self._switchable_r_labels.switch_on(self._owner.r3_now_lbl)
+            elif xray_long >= 1e-3 and xray_long < 2e-3:
+                self._switchable_r_labels.switch_on(self._owner.r4_now_lbl)
+            elif xray_long >= 2e-3:
+                self._switchable_r_labels.switch_on(self._owner.r5_now_lbl)
+            elif xray_long == -1.00e+05:
+                self._switchable_r_labels.switch_off_all()
+
+            pro10 = safe_cast(self._owner.space_weather_data.prot_el[-1][8], float)
+            if pro10 < 10 and pro10 != -1.00e+05:
+                self._switchable_s_labels.switch_on(self._owner.s0_now_lbl)
+            elif pro10 >= 10 and pro10 < 100:
+                self._switchable_s_labels.switch_on(self._owner.s1_now_lbl)
+            elif pro10 >= 100 and pro10 < 1000:
+                self._switchable_s_labels.switch_on(self._owner.s2_now_lbl)
+            elif pro10 >= 1000 and pro10 < 10000:
+                self._switchable_s_labels.switch_on(self._owner.s3_now_lbl)
+            elif pro10 >= 10000 and pro10 < 100000:
+                self._switchable_s_labels.switch_on(self._owner.s4_now_lbl)
+            elif pro10 >= 100000:
+                self._switchable_s_labels.switch_on(self._owner.s5_now_lbl)
+            elif pro10 == -1.00e+05:
+                self._switchable_s_labels.switch_off_all()
+
+            k_index = safe_cast(
+                self._owner.space_weather_data.ak_index[8][11].replace('.', ''), int
+            )
+            self._owner.k_index_lbl.setText(str(k_index))
+            a_index = safe_cast(
+                self._owner.space_weather_data.ak_index[7][7].replace('.', ''), int
+            )
+            self._owner.a_index_lbl.setText(str(a_index))
+
+            if k_index == 0:
+                self._switchable_g_now_labels.switch_on(self._owner.g0_now_lbl)
+                self._k_storm_labels.switch_on(self.k_inactive_lbl)
+                self._owner.expected_noise_lbl.setText("  S0 - S1 (<-120 dBm)  ")
+            elif k_index == 1:
+                self._switchable_g_now_labels.switch_on(self._owner.g0_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_very_quiet_lbl)
+                self._owner.expected_noise_lbl.setText("  S0 - S1 (<-120 dBm)  ")
+            elif k_index == 2:
+                self._switchable_g_now_labels.switch_on(self._owner.g0_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_quiet_lbl)
+                self._owner.expected_noise_lbl.setText("  S1 - S2 (-115 dBm)  ")
+            elif k_index == 3:
+                self._switchable_g_now_labels.switch_on(self._owner.g0_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_unsettled_lbl)
+                self._owner.expected_noise_lbl.setText("  S2 - S3 (-110 dBm)  ")
+            elif k_index == 4:
+                self._switchable_g_now_labels.switch_on(self._owner.g0_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_active_lbl)
+                self._owner.expected_noise_lbl.setText("  S3 - S4 (-100 dBm)  ")
+            elif k_index == 5:
+                self._switchable_g_now_labels.switch_on(self._owner.g1_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_min_storm_lbl)
+                self._owner.expected_noise_lbl.setText("  S4 - S6 (-90 dBm)  ")
+            elif k_index == 6:
+                self._switchable_g_now_labels.switch_on(self._owner.g2_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_maj_storm_lbl)
+                self._owner.expected_noise_lbl.setText("  S6 - S9 (-80 dBm)  ")
+            elif k_index == 7:
+                self._switchable_g_now_labels.switch_on(self._owner.g3_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_sev_storm_lbl)
+                self._owner.expected_noise_lbl.setText("  S9 - S20 (>-60 dBm)  ")
+            elif k_index == 8:
+                self._switchable_g_now_labels.switch_on(self._owner.g4_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_very_sev_storm_lbl)
+                self._owner.expected_noise_lbl.setText("  S20 - S30 (>-60 dBm)  ")
+            elif k_index == 9:
+                self._switchable_g_now_labels.switch_on(self._owner.g5_now_lbl)
+                self._k_storm_labels.switch_on(self._owner.k_ex_sev_storm_lbl)
+                self._owner.expected_noise_lbl.setText("  S30+ (>>-60 dBm)  ")
+            self._owner.expected_noise_lbl.switch_on()
+
+            if a_index >= 0 and a_index < 8:
+                self._a_storm_labels.switch_on(self._owner.a_quiet_lbl)
+            elif a_index >= 8 and a_index < 16:
+                self._a_storm_labels.switch_on(self._owner.a_unsettled_lbl)
+            elif a_index >= 16 and a_index < 30:
+                self._a_storm_labels.switch_on(self._owner.a_active_lbl)
+            elif a_index >= 30 and a_index < 50:
+                self._a_storm_labels.switch_on(self._owner.a_min_storm_lbl)
+            elif a_index >= 50 and a_index < 100:
+                self._a_storm_labels.switch_on(self._owner.a_maj_storm_lbl)
+            elif a_index >= 100 and a_index < 400:
+                self._a_storm_labels.switch_on(self._owner.a_sev_storm_lbl)
+
+            index = self._owner.space_weather_data.geo_storm[6].index("was") + 1
+            k_index_24_hmax = safe_cast(
+                self._owner.space_weather_data.geo_storm[6][index], int
+            )
+            if k_index_24_hmax == 0:
+                self._switchable_g_today_labels.switch_on(self._owner.g0_today_lbl)
+            elif k_index_24_hmax == 1:
+                self._switchable_g_today_labels.switch_on(self._owner.g0_today_lbl)
+            elif k_index_24_hmax == 2:
+                self._switchable_g_today_labels.switch_on(self._owner.g0_today_lbl)
+            elif k_index_24_hmax == 3:
+                self._switchable_g_today_labels.switch_on(self._owner.g0_today_lbl)
+            elif k_index_24_hmax == 4:
+                self._switchable_g_today_labels.switch_on(self._owner.g0_today_lbl)
+            elif k_index_24_hmax == 5:
+                self._switchable_g_today_labels.switch_on(self._owner.g1_today_lbl)
+            elif k_index_24_hmax == 6:
+                self._switchable_g_today_labels.switch_on(self._owner.g2_today_lbl)
+            elif k_index_24_hmax == 7:
+                self._switchable_g_today_labels.switch_on(self._owner.g3_today_lbl)
+            elif k_index_24_hmax == 8:
+                self._switchable_g_today_labels.switch_on(self._owner.g4_today_lbl)
+            elif k_index_24_hmax == 9:
+                self._switchable_g_today_labels.switch_on(self._owner.g5_today_lbl)
+
+            val = safe_cast(
+                self._owner.space_weather_data.ak_index[7][2].replace('.', ''), int
+            )
+            self._owner.sfi_lbl.setText(f"{val}")
+            val = safe_cast(
+                [x[4] for x in self._owner.space_weather_data.sgas
+                    if "SSN" in x][0], int
+            )
+            self._owner.sn_lbl.setText(f"{val:d}")
+
+            for label, pixmap in zip(self.space_weather_labels,
+                                     self._owner.space_weather_data.images):
+                label.pixmap = pixmap
+                label.make_transparent()
+                label.apply_pixmap()
+        elif not self._owner.closing:
+            pop_up(self._owner, title=Messages.BAD_DOWNLOAD,
+                   text=Messages.BAD_DOWNLOAD_MSG).show()
+        self._owner.space_weather_data.remove_data()
--- a/src/themes/elegant_dark/elegant_dark.qss
+++ b/src/themes/elegant_dark/elegant_dark.qss
@@ -303,11 +303,11 @@ QTabWidget {
 	background-color:rgb(247,246,246);
 }
 QTabWidget::pane {
-		border-color: rgb(77,77,77);
+		/* border-color: rgb(77,77,77); */
 		background-color:rgb(101,101,101);
-		border-style: solid;
+		/* border-style: solid;
 		border-width: 1px;
-    	border-radius: 6px;
+    	border-radius: 6px; */
 }
 QTabBar::tab {
 	padding:2px;
--- a/src/themesmanager.py
+++ b/src/themesmanager.py
@@ -1,41 +1,13 @@
 from functools import partial
-from itertools import chain
 import os
 import re
 from PyQt5.QtWidgets import QAction, QActionGroup
 from PyQt5.QtCore import pyqtSlot
 from PyQt5.QtGui import QPixmap
-from constants import Constants
-from switchable_label import SwitchableLabelsIterable
+from constants import Constants, ThemeConstants
 from utilities import pop_up


-class ThemeConstants:
-    """Container class for all the theme-related constants."""
-
-    FOLDER                    = "themes"
-    EXTENSION                 = ".qss"
-    ICONS_FOLDER              = "icons"
-    DEFAULT                   = "dark"
-    CURRENT                   = ".current_theme"
-    COLORS                    = "colors.txt"
-    COLOR_SEPARATOR           = "="
-    DEFAULT_ACTIVE_COLOR      = "#000000"
-    DEFAULT_INACTIVE_COLOR    = "#9f9f9f"
-    DEFAULT_OFF_COLORS        = "#000000", "#434343"
-    DEFAULT_ON_COLORS         = "#4b79a1", "#283e51"
-    DEFAULT_TEXT_COLOR        = "#ffffff"
-    THEME_NOT_FOUND           = "Theme not found"
-    MISSING_THEME             = "Missing theme in '" + FOLDER + "' folder."
-    MISSING_THEME_FOLDER      = "'" + FOLDER + "'" + " folder not found.\nOnly the basic theme is available."
-    THEME_FOLDER_NOT_FOUND    = "'" + FOLDER + "'" + " folder not found"
-    DEFAULT_ICONS_PATH        = os.path.join(FOLDER, DEFAULT, ICONS_FOLDER)
-    DEFAULT_SEARCH_LABEL_PATH = os.path.join(DEFAULT_ICONS_PATH, Constants.SEARCH_LABEL_IMG)
-    DEFAULT_VOLUME_LABEL_PATH = os.path.join(DEFAULT_ICONS_PATH, Constants.VOLUME_LABEL_IMG)
-    CURRENT_THEME_FILE        = os.path.join(FOLDER, CURRENT)
-    DEFAULT_THEME_PATH        = os.path.join(FOLDER, DEFAULT)
-
-
 class _ColorsHandler:
    """Manage the theme's secondary colors.

@@ -46,7 +18,7 @@ class _ColorsHandler:

        Can handle strings representing multiple colors."""

-        MAX_COLORS = 2
+        _MAX_COLORS = 2

        def __init__(self, line):
            """Define the color from the string 'line'.
@@ -76,7 +48,7 @@ class _ColorsHandler:
                return bool(re.match(pattern, col)) and len(col) == 7

            if not self.is_simple_string:
-                if len(self.color_list) <= self.MAX_COLORS:
+                if len(self.color_list) <= self._MAX_COLORS:
                    return all(match_ok(c) for c in self.color_list)
                else:
                    return False
@@ -120,57 +92,15 @@ class ThemeManager:
        self._theme_path = ""
        self._current_theme = ""

-        self._space_weather_labels = SwitchableLabelsIterable(
-            *list(
-                chain(
-                    self._owner.switchable_r_labels,
-                    self._owner.switchable_s_labels,
-                    self._owner.switchable_g_now_labels,
-                    self._owner.switchable_g_today_labels,
-                    self._owner.k_storm_labels,
-                    self._owner.a_storm_labels,
-                    [self._owner.expected_noise_lbl]
-                )
-            )
-        )
-
-        self._space_weather_labels.set(
+        self._owner.spaceweather_screen.refreshable_labels.set(
            "switch_on_colors",
            ThemeConstants.DEFAULT_ON_COLORS
        )
-        self._space_weather_labels.set(
+        self._owner.spaceweather_screen.refreshable_labels.set(
            "switch_off_colors", ThemeConstants.DEFAULT_OFF_COLORS
        )
-
        self._theme_names = {}

-    def _refresh_range_labels(self):
-        """Refresh the range-labels."""
-        self._owner.set_acf_interval_label()
-        self._owner.set_band_filter_label(
-            self._owner.activate_low_band_filter_btn,
-            self._owner.lower_band_spinbox,
-            self._owner.lower_band_filter_unit,
-            self._owner.lower_band_confidence,
-            self._owner.activate_up_band_filter_btn,
-            self._owner.upper_band_spinbox,
-            self._owner.upper_band_filter_unit,
-            self._owner.upper_band_confidence,
-            self._owner.band_range_lbl
-        )
-
-        self._owner.set_band_filter_label(
-            self._owner.activate_low_freq_filter_btn,
-            self._owner.lower_freq_spinbox,
-            self._owner.lower_freq_filter_unit,
-            self._owner.lower_freq_confidence,
-            self._owner.activate_up_freq_filter_btn,
-            self._owner.upper_freq_spinbox,
-            self._owner.upper_freq_filter_unit,
-            self._owner.upper_freq_confidence,
-            self._owner.freq_range_lbl
-        )
-
    @pyqtSlot()
    def _apply(self, theme_path):
        """Apply the selected theme.
@@ -185,12 +115,12 @@ class ThemeManager:
                    item=self._owner.signals_list.currentItem(),
                    previous_item=None
                )
-                self._refresh_range_labels()
-                self._owner.audio_widget.refresh_btns_colors(
+                self._owner.filters.refresh()
+                self._owner.audio_widget.refresh(
                    self._owner.active_color,
                    self._owner.inactive_color
                )
-                self._space_weather_labels.refresh()
+                self._owner.spaceweather_screen.refreshable_labels.refresh()
        else:
            pop_up(self._owner, title=ThemeConstants.THEME_NOT_FOUND,
                   text=ThemeConstants.MISSING_THEME).show()
@@ -222,7 +152,8 @@ class ThemeManager:
                new_theme = ag.addAction(
                    QAction(
                        theme_name,
-                        self._owner, checkable=True
+                        self._owner,
+                        checkable=True
                    )
                )
                self._owner.menu_themes.addAction(new_theme)
@@ -297,20 +228,20 @@ class ThemeManager:
                            inactive_color_ok = True
                        if color.quality == Constants.TEXT_COLOR:
                            text_color_ok = True
-                            self._space_weather_labels.set(
+                            self._owner.spaceweather_screen.refreshable_labels.set(
                                "text_color",
                                color.color_str
                            )
                    for color in color_handler.double_color_list:
                        if color.quality == Constants.LABEL_ON_COLOR:
                            switch_on_color_ok = True
-                            self._space_weather_labels.set(
+                            self._owner.spaceweather_screen.refreshable_labels.set(
                                "switch_on_colors",
                                color.color_list
                            )
                        if color.quality == Constants.LABEL_OFF_COLOR:
                            switch_off_color_ok = True
-                            self._space_weather_labels.set(
+                            self._owner.spaceweather_screen.refreshable_labels.set(
                                "switch_off_colors",
                                color.color_list
                            )
@@ -320,17 +251,17 @@ class ThemeManager:
                self._owner.inactive_color = ThemeConstants.DEFAULT_INACTIVE_COLOR

            if not (switch_on_color_ok and switch_off_color_ok):
-                self._space_weather_labels.set(
+                self._owner.spaceweather_screen.refreshable_labels.set(
                    "switch_on_colors",
                    ThemeConstants.DEFAULT_ON_COLORS
                )
-                self._space_weather_labels.set(
+                self._owner.spaceweather_screen.refreshable_labels.set(
                    "switch_off_colors",
                    ThemeConstants.DEFAULT_OFF_COLORS
                )

            if not text_color_ok:
-                self._space_weather_labels.set(
+                self._owner.spaceweather_screen.refreshable_labels.set(
                    "text_color",
                    ThemeConstants.DEFAULT_TEXT_COLOR
                )
@@ -338,31 +269,37 @@ class ThemeManager:

            try:
                with open(ThemeConstants.CURRENT_THEME_FILE, "w") as current_theme:
-                    current_theme.write(self._theme_path)
+                    current_theme.write(os.path.basename(self._theme_path))
            except Exception:
                pass

-    def start(self):
-        """Start the theme manager."""
-        self._detect_themes()
-        if os.path.exists(ThemeConstants.CURRENT_THEME_FILE):
-            with open(ThemeConstants.CURRENT_THEME_FILE, "r") as current_theme_path:
-                theme_path = current_theme_path.read()
-            theme_name = self._pretty_name(os.path.basename(theme_path))
-            try:
-                self._theme_names[theme_name].setChecked(True)
-            except Exception:
-                pop_up(self._owner, title=ThemeConstants.THEME_NOT_FOUND,
-                       text=ThemeConstants.MISSING_THEME).show()
-            else:
-                self._apply(theme_path)
-        else:
+    def apply_default_theme(self):
+        """Apply the default theme if no theme is set or the theme name is invalid."""
        try:
            self._theme_names[
                self._pretty_name(ThemeConstants.DEFAULT)
            ].setChecked(True)
        except Exception:
-                pop_up(self._owner, title=ThemeConstants.THEME_NOT_FOUND,
-                       text=ThemeConstants.MISSING_THEME).show()
+            pop_up(
+                self._owner,
+                title=ThemeConstants.THEME_NOT_FOUND,
+                text=ThemeConstants.MISSING_THEME
+            ).show()
        else:
            self._apply(ThemeConstants.DEFAULT_THEME_PATH)
+
+    def start(self):
+        """Start the theme manager."""
+        self._detect_themes()
+        if os.path.exists(ThemeConstants.CURRENT_THEME_FILE):
+            with open(ThemeConstants.CURRENT_THEME_FILE, "r") as current_theme_name:
+                theme_path = os.path.join(ThemeConstants.FOLDER, current_theme_name.read())
+            theme_name = self._pretty_name(os.path.basename(theme_path))
+            try:
+                self._theme_names[theme_name].setChecked(True)
+            except Exception:
+                self.apply_default_theme()
+            else:
+                self._apply(theme_path)
+        else:
+            self.apply_default_theme()
--- a/src/threads.py
+++ b/src/threads.py
@@ -2,18 +2,18 @@ import asyncio
 from enum import Enum, auto
 from io import BytesIO
 from math import ceil
-import os.path
-from shutil import rmtree
-from time import perf_counter
-from zipfile import ZipFile
-import aiohttp
-from PyQt5.QtCore import QThread, pyqtSignal
-from constants import Constants, Database, ChecksumWhat
-from utilities import checksum_ok, get_pool_manager, get_cacert_file
 import ssl
-
+from time import perf_counter
+import aiohttp
+from PyQt5.QtCore import QThread, pyqtSignal, pyqtSlot
+from constants import Constants
+from utilities import checksum_ok
+from web_utilities import (
+    get_cacert_file,
+    get_pool_manager,
+)
 # Needed for pyinstaller compilation.
-import encodings.idna
+import encodings.idna  # noqa: 401


 class ThreadStatus(Enum):
@@ -39,30 +39,31 @@ class BaseDownloadThread(QThread):
        super().__init__(parent)
        self.status = ThreadStatus.UNDEFINED

-    def __del__(self):
-        """Force the termination of the thread."""
-        self.terminate()
-        self.wait()
+    # def __del__(self):
+    #     """Force the termination of the thread."""
+    #     self.terminate()
+    #     self.wait()


 class DownloadThread(BaseDownloadThread):
-    """Subclass BaseDownloadThread. Download the database, images and audio samples."""
+    """Subclass BaseDownloadThread. Download the database folder. Used also for software updates."""

    progress = pyqtSignal(int)
    speed_progress = pyqtSignal(float)
    _CHUNK = 128 * 1024
-    _MEGA = 1024**2
    _DELTAT = 2

-    def __init__(self):
+    def __init__(self, min_bytes=1024**2):
        """Just call super().__init__."""
-        self._db = None
-        self._exit_call = False
        super().__init__()
+        self._min_bytes = min_bytes
+        self._data = None
+        self._exit_call = False
+        self._target = None

    def _pretty_len(self, byte_obj):
        """Return a well-formatted number of downloaded MB."""
-        mega = len(byte_obj) / self._MEGA
+        mega = len(byte_obj) / self._min_bytes
        if mega.is_integer():
            return int(mega)
        else:
@@ -71,33 +72,30 @@ class DownloadThread(BaseDownloadThread):
    def _get_download_speed(self, data, delta):
        """Return the download speed in MB/s."""
        return round(
-            (len(data) / self._MEGA) / delta, 2
+            (len(data) / self._min_bytes) / delta, 2
        )

+    @pyqtSlot()
    def set_exit(self):
+        """Time to shutdown the thread.
+
+        Executed in the main thread."""
        self._exit_call = True

-    def run(self):
-        """Override QThread.run. Download the database, images and audio samples.
+    def start(self, target):
+        """Start the thread. Set the correct download options first."""
+        self._target = target
+        super().start()

-        Handle all possible exceptions. Also extract the files
-        in the local folder."""
-        self.status = ThreadStatus.UNDEFINED
-        self._db = None
+    def _download_loop(self):
+        """Read a chunck of the downloaded data at every iteration."""
        raw_data = bytes(0)
        sub_data = bytes(0)
-        try:
-            self._db = get_pool_manager().request(
-                'GET',
-                Database.LINK_LOC,
-                preload_content=False,
-                timeout=4.0
-            )
        start = perf_counter()
        prev_downloaded = 0
        while True:
            try:
-                    data = self._db.read(self._CHUNK)
+                data = self._data.read(self._CHUNK)
            except Exception:
                raise _SlowConnError
            else:
@@ -106,8 +104,8 @@ class DownloadThread(BaseDownloadThread):
                    break
                raw_data += data
                sub_data += data
-                    # Emit a progress signal only if at least 1 MB has been downloaded.
-                    if len(raw_data) - prev_downloaded >= self._MEGA:
+                # Emit a progress signal only if at least self._min_bytes has been downloaded.
+                if len(raw_data) - prev_downloaded >= self._min_bytes:
                    prev_downloaded = len(raw_data)
                    self.progress.emit(self._pretty_len(raw_data))
                if delta >= self._DELTAT:
@@ -116,42 +114,102 @@ class DownloadThread(BaseDownloadThread):
                    )
                    sub_data = bytes(0)
                    start = perf_counter()
+                if self._exit_call:
+                    self._data.release_conn()
+                    break
+        return raw_data
+
+    def run(self):
+        """Override QThread.run. Download the database, images and audio samples.
+
+        Handle all possible exceptions. Also extract the files
+        in the destination folder."""
+        self.status = ThreadStatus.UNDEFINED
+        self._data = None
+
+        try:
+            self._data = get_pool_manager().request(
+                'GET',
+                self._target.url,
+                preload_content=False,
+            )
+            raw_data = self._download_loop()
            if self._exit_call:
                self._exit_call = False
-                        self._db.release_conn()
                return
        except Exception as e:  # No (or bad) internet connection.
-            self._db.release_conn()
+            self._data.release_conn()
            if isinstance(e, _SlowConnError):
                self.status = ThreadStatus.SLOW_CONN_ERR
            else:
                self.status = ThreadStatus.NO_CONNECTION_ERR
            return
-        if self._db.status != 200:
+        if self._data.status != 200:
            self.status = ThreadStatus.BAD_DOWNLOAD_ERR
            return
-        try:
-            is_checksum_ok = checksum_ok(raw_data, ChecksumWhat.FOLDER)
-        except Exception:  # checksum_ok unable to connect to the reference.
-            self.status = ThreadStatus.NO_CONNECTION_ERR
+        if self._wrong_checksum(raw_data):
            return
+        self._target.delete_files()
+        self._extract(raw_data)
+
+    def _wrong_checksum(self, raw_data):
+        """Verify the checksum of the downloaded data and set the status accordingly."""
+        try:
+            is_checksum_ok = checksum_ok(raw_data, self._target.hash_code)
+        except Exception:  # Invalid hash code.
+            self.status = ThreadStatus.NO_CONNECTION_ERR
+            return True
        else:
            if not is_checksum_ok:
                self.status = ThreadStatus.BAD_DOWNLOAD_ERR
-                return
-        if os.path.exists(Constants.DATA_FOLDER):
-            rmtree(Constants.DATA_FOLDER)
+                return True
+            return False
+
+    def _extract(self, raw_data):
+        """Unzip and save the downloaded data into the destination folder."""
        try:
            self.progress.emit(Constants.EXTRACTING_CODE)
            self.speed_progress.emit(Constants.ZERO_FINAL_SPEED)
-            with ZipFile(BytesIO(raw_data)) as zipped:
-                zipped.extractall()
+            with self._target.Extractor.open(fileobj=BytesIO(raw_data)) as zipped:
+                zipped.extractall(path=self._target.dest_path)
        except Exception:
            self.status = ThreadStatus.UNKNOWN_ERR
        else:
            self.status = ThreadStatus.OK


+class UpdatesControllerThread(BaseDownloadThread):
+
+    on_success = pyqtSignal(bool)
+
+    def __init__(self, version_controller):
+        super().__init__()
+        self.version_controller = version_controller
+
+    def run(self):
+        if self.version_controller.update():
+            self.on_success.emit(True)
+        else:
+            self.on_success.emit(False)
+
+
+# class GenercWorkerThread(BaseDownloadThread):
+#     def __init__(self, func, *args, **kwargs):
+#         super().__init__()
+#         self._args = args
+#         self._kwargs = kwargs
+#         self._func
+
+#     def run(self):
+#         self.status = ThreadStatus.UNDEFINED
+#         try:
+#             self._func(self._args, self._kwargs)
+#         except Exception:
+#             self.status = ThreadStatus.UNKNOWN_ERR
+#         else:
+#             self.status = ThreadStatus.OK
+
+
 class _AsyncDownloader:
    """Mixin class for asynchronous threads."""

--- a/src/updater.py
+++ b/src/updater.py
@@ -0,0 +1,200 @@
+import argparse
+import os
+import os.path
+import sys
+from PyQt5.QtCore import QObject, QProcess
+from PyQt5.QtGui import QPixmap
+from PyQt5.QtWidgets import QApplication, qApp
+from download_window import DownloadWindow
+from constants import Constants, DownloadTarget
+from downloadtargetfactory import get_download_target
+
+
+__VERSION__ = "0.0.1"
+
+
+# Global stylesheet.
+stylesheet = """
+/*************************************
+Main Window and Splitters
+**************************************/
+QWidget:window {
+    background-color: #29353B;
+}
+
+/*************************************
+Main menu (Bar)
+**************************************/
+QMenuBar {
+    background-color: transparent;
+    color: #AFBDC4;
+}
+
+QMenuBar::item {
+    background-color: transparent;
+}
+
+QMenuBar::item:disabled {
+    color: gray;
+}
+
+QMenuBar::item:selected {
+    color: #FFFFFF;
+    border-bottom: 2px solid #88cc00;
+}
+
+QMenuBar::item:pressed {
+    color: #FFFFFF;
+    border-bottom: 2px solid #88cc00;
+}
+
+QToolBar {
+    background-color: transparent;
+    border: 1px solid transparent;
+}
+
+QToolBar:handle {
+    background-color: transparent;
+    border-left: 2px dotted #80CBC4;
+    color: transparent;
+}
+
+QToolBar::separator {
+    border: 0;
+}
+
+QMenu {
+    background-color: #263238;
+    color: #AFBDC4;
+}
+
+QMenu::item:selected {
+    color: #FFFFFF;
+}
+
+QMenu::item:pressed {
+    color: #FFFFFF;
+}
+
+QMenu::separator {
+    background-color: transparent;
+    height: 1px;
+    margin-left: 10px;
+    margin-right: 10px;
+    margin-top: 5px;
+    margin-bottom: 5px;
+}
+
+
+/*************************************
+Progressbar
+**************************************/
+QProgressBar
+{
+    border: 2px solid grey;
+    border-radius: 5px;
+    text-align: center;
+}
+
+QProgressBar::chunk
+{
+    background-color: #88cc00;
+    width: 2.15px;
+    margin: 0.5px;
+}
+
+/*************************************
+Labels and Rich Text boxes
+**************************************/
+QLabel {
+    background-color: transparent;
+    color: #CFD8DC;
+}
+
+QDialog {
+    background-color: transparent;
+    color: #949a9c;
+}
+
+QTextBrowser {
+    background-color: transparent;
+    color: #949a9c;
+}
+
+/*************************************
+Buttons
+**************************************/
+QPushButton {
+    background-color: transparent;
+    color: #AFBDC4;
+    border: 1px solid transparent;
+    padding: 4px 22px;
+}
+
+QPushButton:hover {
+    border-left: 2px solid #88cc00;
+    border-right: 2px solid #88cc00;
+    color: #FFFFFF;
+}
+
+QPushButton:pressed {
+    color: #FFFFFF;
+}
+
+QPushButton:disabled {
+    color:#546E7A;
+}
+
+QPushButton:checked {
+    color: #88cc00;
+}
+"""
+
+
+class _ArtemisUpdater(QObject):
+    """Updater of the main software."""
+
+    def __init__(self, target):
+        super().__init__()
+        self.target = get_download_target(DownloadTarget.SOFTWARE, target)
+        self.download_window = DownloadWindow()
+        self.download_window.setStyleSheet(stylesheet)
+        self.download_window.cancel_btn.clicked.connect(qApp.quit)
+        self.download_window.complete.connect(self.start_main_program)
+
+    def start(self):
+        """Close the main program and start the download."""
+        self.download_window.activate(self.target)
+
+    def init_ok(self):
+        return self.target.url and self.target.hash_code and self.target.size > 0
+
+    def start_main_program(self):
+        """Restart the (updated) main program and close the updater."""
+        self.download_window.setVisible(False)
+        artemis = QProcess()
+        try:
+            artemis.startDetached(Constants.EXECUTABLE_NAME)
+        except BaseException:
+            pass
+        qApp.quit()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(prog='Artemis Updater')
+    parser.add_argument("url", nargs="?", default="", type=str, help="Download url")
+    parser.add_argument("hash_code", nargs="?", default="", type=str, help="sha256 of the file")
+    parser.add_argument("size", nargs="?", default=0, type=int, help="Size (KB) of the file")
+    parser.add_argument('--version', action='version', version=__VERSION__)
+    args = parser.parse_args()
+
+    my_app = QApplication(sys.argv)
+    ARTEMIS_ICON = os.path.join(":", "icon", "default_pics", "Artemis3.500px.png")
+    img = QPixmap(ARTEMIS_ICON)
+    updater = _ArtemisUpdater(args)
+
+    if not updater.init_ok():
+        updater.start_main_program()
+    else:
+        updater.start()
+        sys.exit(my_app.exec_())
--- a/src/updatescontroller.py
+++ b/src/updatescontroller.py
@@ -0,0 +1,141 @@
+import subprocess as sp
+import webbrowser
+from PyQt5.QtCore import QObject, pyqtSlot, QProcess
+from PyQt5.QtWidgets import QMessageBox, qApp
+from constants import Constants, Messages, DownloadTarget
+from downloadtargetfactory import get_download_target
+from utilities import pop_up
+from os_utilities import IS_MAC
+from executable_utilities import IS_BINARY
+from threads import UpdatesControllerThread
+from versioncontroller import VersionController
+
+
+class UpdatesController(QObject):
+
+    def __init__(self, current_version, owner):
+        super().__init__()
+        self._owner = owner
+        self._download_window = self._owner.download_window
+        self._current_version = current_version
+        self.version_controller = VersionController()
+        self._updates_thread = UpdatesControllerThread(self.version_controller)
+        self._updates_thread.on_success.connect(self._startup_updates_check)
+
+    def start(self):
+        """Start the thread."""
+        if IS_BINARY:
+            self._updates_thread.start()
+
+    @pyqtSlot()
+    def start_verify_software_version(self):
+        if not IS_BINARY:
+            pop_up(
+                self._owner,
+                title=Messages.FEATURE_NOT_AVAILABLE,
+                text=Messages.SCRIPT_NOT_UPDATE
+            ).show()
+            return
+        if not self._download_window.isVisible():
+            self._updates_thread.start()
+
+    @pyqtSlot(bool)
+    def _verify_software_version(self, success):
+        """Verify if there is a new software version.
+
+        Otherwise notify the user that the software is up to date."""
+        if not self._download_window.isVisible():
+            if success:
+                new_version_found = self._check_new_version()
+                if not new_version_found:
+                    pop_up(
+                        self._owner,
+                        title=Messages.UP_TO_DATE,
+                        text=Messages.UP_TO_DATE_MSG
+                    ).show()
+            else:
+                pop_up(
+                    self._owner,
+                    title=Messages.NO_CONNECTION,
+                    text=Messages.NO_CONNECTION_MSG
+                ).show()
+
+    @pyqtSlot(bool)
+    def _startup_updates_check(self, success):
+        self._updates_thread.on_success.disconnect()
+        self._updates_thread.on_success.connect(self._verify_software_version)
+        if success:
+            if not self._check_new_version():
+                # Check for a new version of the updater only if Artemis is up to date.
+                self._check_updater_version()
+
+    def _check_new_version(self):
+        """Check whether there is a new software version available.
+
+        Does something only if the running program is a compiled version."""
+        if not IS_BINARY:
+            return None
+        latest_version = self.version_controller.software.version
+        if latest_version is None:
+            return False
+        if latest_version == self._current_version:
+            return False
+        answer = pop_up(
+            self._owner,
+            title=Messages.NEW_VERSION_AVAILABLE,
+            text=Messages.NEW_VERSION_MSG(latest_version),
+            informative_text=Messages.DOWNLOAD_SUGG_MSG,
+            is_question=True,
+        ).exec()
+        if answer == QMessageBox.Yes:
+            if IS_MAC:
+                webbrowser.open(self.version_controller.software.url)
+            else:
+                updater = QProcess()
+                command = Constants.UPDATER_SOFTWARE + " " + \
+                    self.version_controller.software.url + \
+                    " " + self.version_controller.software.hash_code + \
+                    " " + str(self.version_controller.software.size)
+                try:
+                    updater.startDetached(command)
+                except BaseException:
+                    pass
+                else:
+                    qApp.quit()
+        return True
+
+    def _check_updater_version(self):
+        """Check is a new version of the updater is available.
+
+        If so, ask to download the new version.
+        If the software is not a compiled version, the function is a NOP."""
+        if not IS_BINARY or IS_MAC:
+            return
+        latest_updater_version = self.version_controller.updater.version
+        try:
+            with sp.Popen(
+                [Constants.UPDATER_SOFTWARE, "--version"],
+                encoding="UTF-8",
+                stdout=sp.PIPE,
+                stderr=sp.STDOUT,
+                stdin=sp.DEVNULL  # Needed to avoid OsError: [WinError 6] The handle is invalid.
+            ) as proc:
+                updater_version = proc.stdout.read().rstrip("\r\n")  # Strip any possible newline, to be sure.
+        except Exception:
+            updater_version = latest_updater_version
+        if latest_updater_version is None:
+            return
+        if updater_version != latest_updater_version:
+            answer = pop_up(
+                self._owner,
+                title=Messages.UPDATES_AVAILABALE,
+                text=Messages.UPDATES_MSG,
+                is_question=True,
+            ).exec()
+            if answer == QMessageBox.Yes:
+                self._download_window.activate(
+                    get_download_target(
+                        DownloadTarget.UPDATER,
+                        self.version_controller.updater
+                    )
+                )
--- a/src/utilities.py
+++ b/src/utilities.py
@@ -1,19 +1,29 @@
 from functools import partial
 import hashlib
-import sys
-import os
 from PyQt5.QtWidgets import QMessageBox
-import urllib3
-from constants import Constants, Signal, Database, ChecksumWhat
+from constants import Constants, Signal


-def resource_path(relative_path):
-    """Get absolute path to resource, works for dev and for PyInstaller."""
-    try:
-        base_path = sys._MEIPASS
-    except Exception:
-        base_path = os.path.abspath(".")
-    return os.path.join(base_path, relative_path)
+class UniqueMessageBox(QMessageBox):
+    """Subclass of QMessageBox. Overrides only the exec method.
+
+    Only one instance of this class can execute super().exec() exec at a given time.
+    If another instance is the the exec loop, calling exec simply return None."""
+
+    _open_message = False
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    def exec(self):
+        """Overrides QMessageBox.exec. Call the parent method if there are no
+        other instances executing exec. Otherwise return None,"""
+        if UniqueMessageBox._open_message:
+            return None
+        UniqueMessageBox._open_message = True
+        answer = super().exec()
+        UniqueMessageBox._open_message = False
+        return answer


 def uncheck_and_emit(button):
@@ -23,7 +33,30 @@ def uncheck_and_emit(button):
        button.clicked.emit()


-def pop_up(cls, title, text,
+def show_matching_strings(list_elements, text):
+    """Show all elements of QListWidget that matches (even partially) a target text.
+
+    Arguments:
+    list_elements -- the QListWidget
+    text -- the target text."""
+    for index in range(list_elements.count()):
+        item = list_elements.item(index)
+        if text.lower() in item.text().lower() or item.isSelected():
+            item.setHidden(False)
+        else:
+            item.setHidden(True)
+
+
+def get_field_entries(db_entry, separator=Constants.FIELD_SEPARATOR):
+    """Take a database entry and optionally a separator string.
+
+    Return a list obtained by splitting the signal field with separator."""
+    return [
+        x.strip() for x in db_entry.split(separator)
+    ]
+
+
+def pop_up(instance, title, text,
           informative_text=None,
           connection=None,
           is_question=False,
@@ -35,7 +68,7 @@ def pop_up(cls, title, text,
    connection -- a callable to connect the message when emitting the finished signal.
    is_question -- whether the message contains a question.
    default_btn -- the default button for the possible answer to the question."""
-    msg = QMessageBox(cls)
+    msg = UniqueMessageBox(instance)
    msg.setWindowTitle(title)
    msg.setText(text)
    if informative_text:
@@ -49,46 +82,15 @@ def pop_up(cls, title, text,
    return msg


-def is_mac_os():
-    """Return True if running OS is Mac."""
-    return sys.platform == 'darwin'
+def checksum_ok(data, reference_hash_code):
+    """Check whether the checksum of the 'data' argument is correct.

-
-def get_cacert_file():
-    """Return the path to the cacert.pem file."""
-    if hasattr(sys, "_MEIPASS"):
-        ca_certs = os.path.join(sys._MEIPASS, 'cacert.pem')
-    else:
-        ca_certs = 'cacert.pem'
-    return ca_certs
-
-
-def get_pool_manager():
-    """Return a urllib3.PoolManager object."""
-    return urllib3.PoolManager(ca_certs=get_cacert_file())
-
-
-def checksum_ok(data, what):
-    """Check whether the checksum of the 'data' argument is correct."""
+    Expects a sha256 code as argument."""
+    if reference_hash_code is None:
+        raise Exception("ERROR: Invalid hash code.")
    code = hashlib.sha256()
    code.update(data)
-    if what is ChecksumWhat.FOLDER:
-        n = 0
-    elif what is ChecksumWhat.DB:
-        n = 1
-    else:
-        raise ValueError("Wrong entry name.")
-    try:
-        # The downloaded file is a csv file with columns (last version == last line):
-        # data.zip_SHA256 | db.csv_SHA256 | Version | Creation_date
-        reference = get_pool_manager().request(
-            'GET',
-            Database.LINK_REF,
-            timeout=4.0
-        ).data.decode("utf-8").splitlines()[-1].split(Database.DELIMITER)[n]
-    except Exception:
-        raise
-    return code.hexdigest() == reference
+    return code.hexdigest() == reference_hash_code


 def connect_events_to_func(events_to_connect, fun_to_connect, fun_args):
--- a/src/versioncontroller.py
+++ b/src/versioncontroller.py
@@ -0,0 +1,111 @@
+from io import BytesIO
+import json
+from constants import Constants
+from os_utilities import get_os
+from web_utilities import download_file
+
+
+"""This module exposes just one class: VersionController.
+
+All the relevant information can be accessed with the dot notation on an instance of such class, e.g.:
+               version_controller.software.hash_code
+is the hash_code of the latest release of the software running on the current OS."""
+
+
+def _download_versions_file():
+    """Download the json file containing all the information
+    about the latest version of the software. Return a dictionary
+    containing only the information for the running OS.
+
+    Return a dictionary from a json with the following structure:
+    {
+        "windows": {
+            "software": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            },
+            "updater": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            }
+        },
+        "linux": {
+            "software": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            },
+            "updater": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            }
+        },
+        "mac": {
+            "software": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            },
+            "updater": {
+                "version": "...",
+                "url": "...",
+                "hash_code": "...",
+                "size": ...
+            }
+        }
+    }
+    """
+    try:
+        version_dict = json.load(
+            BytesIO(download_file(Constants.VERSION_LINK))
+        )[get_os()]
+    except Exception:
+        return None
+    else:
+        return version_dict
+
+
+class VersionController:
+    """Dynamically create attributes corresponding to elements of a dictionary.
+
+    Used to get updates information."""
+
+    def __init__(self, dct=None):
+        """Initialize the dictionary"""
+        super().__init__()
+        self._dct = dct
+
+    def __getattr__(self, attr):
+        """Override super().__getattr__. Dynamically create new attributes
+        corresponding to elements of the diciotnary."""
+        if self._dct is None:
+            if not self.update():
+                return None
+        try:
+            dct_element = self._dct[attr]
+        except Exception("ERROR: Invalid attribute!"):
+            return None
+        else:
+            if isinstance(dct_element, dict):
+                setattr(self, attr, type(self)(dct_element))
+            else:
+                setattr(self, attr, dct_element)
+            return getattr(self, attr)
+
+    def update(self):
+        """Reset the dictionary to the correspondig json file containing
+        the latest version information. Call this function inside a Qthread."""
+        dct = _download_versions_file()
+        if dct is not None:
+            self._dct = dct
+            return True
+        else:
+            return False
--- a/src/weatherdata.py
+++ b/src/weatherdata.py
@@ -1,10 +1,12 @@
 import re
 from PyQt5.QtGui import QPixmap
 from PyQt5.QtCore import pyqtSlot, pyqtSignal, QObject
-from threads import (BaseDownloadThread,
+from threads import (
+    BaseDownloadThread,
    UpdateSpaceWeatherThread,
    ThreadStatus,
-                     UpdateForecastThread)
+    UpdateForecastThread
+)
 from constants import Constants
 from switchable_label import MultiColorSwitchableLabel
 from utilities import safe_cast
--- a/src/web_utilities.py
+++ b/src/web_utilities.py
@@ -0,0 +1,51 @@
+import os
+import sys
+import urllib3
+from constants import Database
+from executable_utilities import IS_BINARY
+
+
+def get_cacert_file():
+    """Return the path to the cacert.pem file."""
+    if IS_BINARY:
+        ca_certs = os.path.join(sys._MEIPASS, 'cacert.pem')
+    else:
+        ca_certs = 'cacert.pem'
+    return ca_certs
+
+
+def get_pool_manager():
+    """Return a urllib3.PoolManager object."""
+    return urllib3.PoolManager(ca_certs=get_cacert_file())
+
+
+def download_file(url, encoding=""):
+    resp = get_pool_manager().request(
+        'GET',
+        url,
+        preload_content=True,
+        timeout=4.0
+    ).data
+    if encoding:
+        return resp.decode(encoding)
+    return resp
+
+
+def _download_multiline_file_as_list(url=Database.LINK_REF):
+    """Download a text file and return the last line as a list.
+
+    The downloaded file is a csv file with columns (last version == last line):
+    data.zip_SHA256 | db.csv_SHA256 | Version | Creation_date"""
+    try:
+        f = download_file(url, encoding="UTF-8").splitlines()[-1].split(Database.DELIMITER)
+    except Exception:
+        return None
+    return f
+
+
+def get_folder_hash_code():
+    return _download_multiline_file_as_list()[0]
+
+
+def get_db_hash_code():
+    return _download_multiline_file_as_list()[1]
--- a/unused_installation_scripts/README.md
+++ b/unused_installation_scripts/README.md
@@ -60,19 +60,3 @@ This folder contains a third option to run Artemis 3 on your pc. The method of i
 > ### MacOS:
 >
 > 1. To Be Completed...
-
-## License
-This program (ARTEMIS 3, 2014-2019) is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with this program. If not, see: www.gnu.org/licenses
-
-## Thanks
-* **Marco Dalla Tiezza** - *Artemis I-II developer, DB parsing, Website*
-* [**Alessandro Ceccato**](https://github.com/alessandro90 "GitHub profile") - *Artemis III lead developer*
-* **Paolo Romani (IZ1MLL)** - *Lead β Tester, RF specialist*
-* **Carl Colena** - *Sigidwiki admin, β Tester, Signals expert*
-* **Marco Bortoli** - *macOS deployment, β Tester*
-* **Pierpaolo Pravatto** - *Wiki page, β Tester*
-* **Francesco Capostagno, Luca, Pietro** - *β Tester*
Author	SHA1	Message	Date
Alessandro	808a63f57c	Update v3.1.0 release date in changelog	2019-10-21 23:45:37 +02:00
Marco Dalla Tiezza	e03d2f51ba	Updated GLIBC reequirements for Linux	2019-10-20 22:09:36 +02:00
AresValley	0385f7324c	Solved minor bu in windows shell script (wrong folder structure)	2019-10-18 16:24:00 +02:00
marbort	7ac15e7d45	macOS specfile minor changes Removed unnecessary parenthesis in specfile for macOS that prevented successful building of .app package	2019-10-17 12:33:30 +02:00
Alessandro	71d898c966	Fix 'unreleased' link in CHANGELOG.md	2019-10-16 21:20:02 +02:00
Alessandro	e062d0befd	Update the changelog to the version 3.1.0	2019-10-15 19:17:47 +02:00
Alessandro	8e79bf6adf	Fix a bug in the *.spec files and also apply the following major changes: - Add support for adding the base folder to PATH. - Only display one pop up window at a time in order to avoid confusion. - Add automatic updates feature: - Windows and Linux versions will be shipped with an updater program used to update both Artemis and the updater itself. - MacOs versions will not have the updater. Instead the user will be asked to download the new software version (if present) via browser.	2019-10-15 19:14:29 +02:00
Alessandro	08b3312b23	Ensure compatibility of the new version with old database format (ACF value structure)	2019-09-08 15:58:09 +02:00
Alessandro	0606549a7d	Merge branch 'change_layout'	2019-09-08 15:26:11 +02:00
Alessandro	643e6c7457	Merge branch 'minor_improvements' (fix conflicts on readme files)	2019-09-08 15:25:22 +02:00
Alessandro	44747464da	Add a GitHub link. Also improve .spec files (no need to copy source files). Also distinguish from running binary or script in the displayed version.	2019-09-07 23:34:58 +02:00
Marco	e36f04f70b	Readme fix	2019-09-05 09:42:48 +02:00
Marco	9560f8747f	Merge branch 'readme_3.0.2'	2019-09-05 09:27:48 +02:00
Alessandro	40e2e01088	Move main and filter tab at an inner level	2019-09-04 20:08:57 +02:00
Alessandro	1509e04c93	Closes #9 Add support for complex/multiple ACF values	2019-09-04 19:49:16 +02:00
Marco Dalla Tiezza	d30a9b7aa9	GLIBC minimum requirements, ACF details on variable values	2019-09-02 00:17:32 +02:00
Alessandro	4a54ef54cb	Major refactor of filters and spaceweather	2019-09-01 12:28:31 +02:00
Marco Dalla Tiezza	d37c8e96d6	Updated thanks	2019-08-31 21:17:35 +02:00
Marco Dalla Tiezza	4855b232d8	ACF Update	2019-08-31 21:00:31 +02:00
Alessandro	6870774577	Update readme	2019-08-09 18:50:20 +02:00
Alessandro	461da37fdf	Set correct sizes for all the audio buttons for high res screens	2019-08-09 18:41:52 +02:00
Alessandro	7e897bbb82	Fix #12 An audio sample can be paused and a different one can be played without a program crash	2019-08-04 11:12:58 +02:00
Marco	1db7f14a27	Removed empty item in a list	2019-08-03 23:39:26 +02:00
Marco	fd1c2a62f1	Typo fixing	2019-08-03 23:37:58 +02:00
Marco	cceed86859	Merge branch 'One_dir_specs'	2019-08-03 23:35:43 +02:00
Marco	ec35400087	Updated README	2019-08-03 23:35:05 +02:00
Marco	beb94d9d07	One-Dir spec files for Windows and Linux	2019-08-03 23:20:23 +02:00
alessandro90	047a612f19	Update requirements (cherry picked from commit 791cdbff987fbee2bae1e31b348b256ead3cd1d1)	2019-08-01 17:49:24 +02:00
alessandro90	5ae02456ba	Fix changelog typo	2019-08-01 16:48:44 +02:00