diff --git a/artemis/resources.py b/artemis/resources.py
index fcdb427..33fd87b 100644
--- a/artemis/resources.py
+++ b/artemis/resources.py
@@ -6635,7 +6635,7 @@ G@\x11\x10HG\x93Hp\xec\x0au\xe3\xcd\x1e\xf4\
 >k\xd0\xd3b\x1eG\xb5_d\xde\xb6{\x8f\x95\xc5\
 U\xaf\xbc\xfd\xe9\xb5\x9f\xe5\xe3}r\xba?\xbbI\x06\
 \xfe\xfc\x0f\xf4\xcd*2\
-\x00\x00\x06\x95\
+\x00\x00\x070\
 i\
 mport QtQuick\x0d\x0ai\
 mport QtQuick.Wi\
@@ -6674,75 +6674,84 @@ ceived\x0d\x0a        \
 progressBar.to =\
  bytesTotal\x0d\x0a   \
  }\x0d\x0a\x0d\x0a    functi\
-on updateStatus(\
-arg) {\x0d\x0a        \
-progressLabel.te\
-xt = arg\x0d\x0a    }\x0d\
-\x0a\x0d\x0a    Page {\x0d\x0a \
-       id: page\x0d\
-\x0a        anchors\
-.fill: parent\x0d\x0a\x0d\
-\x0a        ColumnL\
-ayout {\x0d\x0a       \
-     id: columnL\
-ayout\x0d\x0a         \
-   anchors.fill:\
- parent\x0d\x0a\x0d\x0a     \
-       Label {\x0d\x0a\
-                \
-text: qsTr(\x22Down\
-loading in progr\
-ess...\x22)\x0d\x0a      \
-          Layout\
-.alignment: Qt.A\
-lignHCenter | Qt\
-.AlignVCenter\x0d\x0a \
-           }\x0d\x0a\x0d\x0a\
-            Prog\
-ressBar {\x0d\x0a     \
-           id: p\
-rogressBar\x0d\x0a    \
-            Layo\
-ut.rightMargin: \
-20\x0d\x0a            \
-    Layout.leftM\
-argin: 20\x0d\x0a     \
-           Layou\
-t.fillWidth: tru\
-e\x0d\x0a             \
-   value: 0\x0d\x0a   \
-             to:\
- 0\x0d\x0a            \
-}\x0d\x0a\x0d\x0a           \
- Label {\x0d\x0a      \
-          id: pr\
-ogressLabel\x0d\x0a   \
-             Lay\
-out.alignment: Q\
-t.AlignHCenter |\
- Qt.AlignVCenter\
-\x0d\x0a            }\x0d\
-\x0a\x0d\x0a            B\
-utton {\x0d\x0a       \
+on setIndetermin\
+ateBar() {\x0d\x0a    \
+    progressBar.\
+indeterminate = \
+true\x0d\x0a    }\x0d\x0a\x0d\x0a \
+   function upda\
+teStatus(arg) {\x0d\
+\x0a        progres\
+sLabel.text = ar\
+g\x0d\x0a    }\x0d\x0a\x0d\x0a    \
+Page {\x0d\x0a        \
+id: page\x0d\x0a      \
+  anchors.fill: \
+parent\x0d\x0a\x0d\x0a      \
+  ColumnLayout {\
+\x0d\x0a            id\
+: columnLayout\x0d\x0a\
+            anch\
+ors.fill: parent\
+\x0d\x0a\x0d\x0a            \
+Label {\x0d\x0a       \
          text: q\
-sTr(\x22Abort\x22)\x0d\x0a  \
-              ic\
-on.source: \x22qrc:\
-/images/icons/ab\
-ort.svg\x22\x0d\x0a      \
-          displa\
-y: AbstractButto\
-n.TextBesideIcon\
+sTr(\x22Downloading\
+ in progress...\x22\
+)\x0d\x0a             \
+   Layout.alignm\
+ent: Qt.AlignHCe\
+nter | Qt.AlignV\
+Center\x0d\x0a        \
+    }\x0d\x0a\x0d\x0a       \
+     ProgressBar\
+ {\x0d\x0a            \
+    id: progress\
+Bar\x0d\x0a           \
+     Layout.righ\
+tMargin: 20\x0d\x0a   \
+             Lay\
+out.leftMargin: \
+20\x0d\x0a            \
+    Layout.fillW\
+idth: true\x0d\x0a    \
+            inde\
+terminate: false\
 \x0d\x0a              \
-  Layout.alignme\
-nt: Qt.AlignHCen\
-ter | Qt.AlignBo\
-ttom\x0d\x0a          \
-      onClicked:\
- { onAbort() }\x0d\x0a\
-            }\x0d\x0a \
-       }\x0d\x0a    }\x0d\
-\x0a}\x0d\x0a\
+  value: 0\x0d\x0a    \
+            to: \
+0\x0d\x0a            }\
+\x0d\x0a\x0d\x0a            \
+Label {\x0d\x0a       \
+         id: pro\
+gressLabel\x0d\x0a    \
+            Layo\
+ut.alignment: Qt\
+.AlignHCenter | \
+Qt.AlignVCenter\x0d\
+\x0a            }\x0d\x0a\
+\x0d\x0a            Bu\
+tton {\x0d\x0a        \
+        Layout.a\
+lignment: Qt.Ali\
+gnHCenter | Qt.A\
+lignBottom\x0d\x0a    \
+            text\
+: qsTr(\x22Abort\x22)\x0d\
+\x0a               \
+ icon.source: \x22q\
+rc:/images/icons\
+/abort.svg\x22\x0d\x0a   \
+             dis\
+play: AbstractBu\
+tton.TextBesideI\
+con\x0d\x0a           \
+     flat: true\x0d\
+\x0a               \
+ onClicked: { on\
+Abort() }\x0d\x0a     \
+       }\x0d\x0a      \
+  }\x0d\x0a    }\x0d\x0a}\x0d\x0a\
 \x00\x00\x05\xac\
 i\
 mport QtQuick\x0d\x0ai\
@@ -7293,12 +7302,12 @@ qt_resource_struct = b"\
 \x00\x00\x01\x8f\xff^8P\
 \x00\x00\x03<\x00\x01\x00\x00\x00\x01\x00\x01>\xe2\
 \x00\x00\x01\x8f\xff^8P\
-\x00\x00\x05\xa8\x00\x00\x00\x00\x00\x01\x00\x01\x9f\xdf\
+\x00\x00\x05\xa8\x00\x00\x00\x00\x00\x01\x00\x01\xa0z\
 \x00\x00\x01\x8f\xff^8P\
 \x00\x00\x03r\x00\x01\x00\x00\x00\x01\x00\x01I\x0c\
 \x00\x00\x01\x8f\xff^8_\
 \x00\x00\x05\x86\x00\x00\x00\x00\x00\x01\x00\x01\x99F\
-\x00\x00\x01\x90\x03\xb0\x82B\
+\x00\x00\x01\x90\x0e\xde\xeeO\
 \x00\x00\x03X\x00\x02\x00\x00\x00\x04\x00\x00\x00+\
 \x00\x00\x00\x00\x00\x00\x00\x00\
 \x00\x00\x04\xc4\x00\x01\x00\x00\x00\x01\x00\x01v\x14\
@@ -7317,13 +7326,13 @@ qt_resource_struct = b"\
 \x00\x00\x01\x8f\xff^8P\
 \x00\x00\x05\x06\x00\x00\x00\x00\x00\x01\x00\x01\x85\xad\
 \x00\x00\x01\x8f\xff^8P\
-\x00\x00\x05\xdc\x00\x01\x00\x00\x00\x01\x00\x01\xa8\x92\
+\x00\x00\x05\xdc\x00\x01\x00\x00\x00\x01\x00\x01\xa9-\
 \x00\x00\x01\x8f\xff^8_\
-\x00\x00\x06$\x00\x01\x00\x00\x00\x01\x00\x01\xae\xd7\
+\x00\x00\x06$\x00\x01\x00\x00\x00\x01\x00\x01\xafr\
 \x00\x00\x01\x8f\xff^8_\
-\x00\x00\x05\xc0\x00\x01\x00\x00\x00\x01\x00\x01\xa5\x8f\
+\x00\x00\x05\xc0\x00\x01\x00\x00\x00\x01\x00\x01\xa6*\
 \x00\x00\x01\x8f\xff^8_\
-\x00\x00\x06\x00\x00\x01\x00\x00\x00\x01\x00\x01\xabU\
+\x00\x00\x06\x00\x00\x01\x00\x00\x00\x01\x00\x01\xab\xf0\
 \x00\x00\x01\x8f\xff^8_\
 "
 
diff --git a/artemis/ui/artemis.py b/artemis/ui/artemis.py
index f55fe3d..7506138 100644
--- a/artemis/ui/artemis.py
+++ b/artemis/ui/artemis.py
@@ -226,7 +226,6 @@ class UIArtemis(QObject):
         self.downloader.finished.connect(self.update_manager.post_download_db)
         self.downloader.on_start(
             self.update_manager.remote_db_url,
-            self.update_manager.remote_db_size,
             DATA_DIR
         )
 
diff --git a/artemis/ui/downloader.py b/artemis/ui/downloader.py
index 99f42ad..c2f9e7e 100644
--- a/artemis/ui/downloader.py
+++ b/artemis/ui/downloader.py
@@ -1,3 +1,5 @@
+import requests
+
 from PySide6.QtQml import QQmlApplicationEngine
 from PySide6.QtCore import QObject, Slot, Signal, QUrl, QSaveFile, QDir, QIODevice
 from PySide6.QtNetwork import QNetworkReply, QNetworkRequest, QNetworkAccessManager
@@ -7,11 +9,12 @@ from artemis.utils.constants import Messages
 
 class UIDownloader(QObject):
     # Python > QML Signals
-    finished = Signal()
     show_ui = Signal()
     close_ui = Signal()
     update_progress_bar = Signal(int, int)
+    set_indeterminate_bar = Signal()
     update_status = Signal(str)
+    finished = Signal()
 
 
     def __init__(self, parent):
@@ -25,6 +28,10 @@ class UIDownloader(QObject):
 
         self.file_url = None
         self.file_size = None
+        self.dest_file = None
+        self.file = None
+        self.manager = None
+        self.reply = None
 
         self._connect()
 
@@ -37,17 +44,22 @@ class UIDownloader(QObject):
         self.show_ui.connect(self._window.show)
         self.close_ui.connect(self._window.close)
         self.update_progress_bar.connect(self._window.updateProgressBar)
+        self.set_indeterminate_bar.connect(self._window.setIndeterminateBar)
         self.update_status.connect(self._window.updateStatus)
 
 
-    def on_start(self, url, filesize, save_path):
-        """ Start the download of the DB taking the needed url and size from
-            the attributes of the UpdatesController class
+    def on_start(self, url, save_path):
+        """ Start the download process using the specified URL
+
+        Args:
+            url (str): url from where download the file
+            save_path (str): path where to save the downloaded file
         """
+
         self.show_ui.emit()
 
         self.file_url = QUrl(url)
-        self.file_size = filesize
+        self.file_size = self._get_filesize(url)
         dest_path = QDir(save_path)
         self.dest_file = dest_path.filePath(self.file_url.fileName())
         self.file = QSaveFile(self.dest_file)
@@ -69,7 +81,8 @@ class UIDownloader(QObject):
 
     @Slot()
     def on_abort(self):
-        """ Stop the download when user press abort button """
+        """ Stop the download when user presses the abort button
+        """
         if self.reply:
             self.reply.abort()
             self.update_progress_bar.emit(0, 0)
@@ -80,7 +93,8 @@ class UIDownloader(QObject):
 
     @Slot()
     def on_ready_read(self):
-        """ Get available bytes and store them into the file """
+        """ Write available bytes to the file
+        """
         if self.reply:
             if self.reply.error() == QNetworkReply.NoError:
                 self.file.write(self.reply.readAll())
@@ -88,8 +102,9 @@ class UIDownloader(QObject):
 
     @Slot()
     def on_finished(self):
-        """ Delete reply, close the file, check the hash for integrity,
-            extract the database and delete the downloaded zip
+        """ Finalize the download process and if no errors
+            occurrs emits the finished signal usefulle for
+            a callback
         """
         if self.reply:
             self.reply.deleteLater()
@@ -105,10 +120,13 @@ class UIDownloader(QObject):
 
     @Slot(int, int)
     def on_progress(self, bytesReceived: int):
-        """ Update progress bar and label
+        """ Update progress bar and status label
         """
-        self.update_status.emit("{:.1f} Mb / {:.1f} Mb".format(bytesReceived/10**6, self.file_size/10**6))
-        self.update_progress_bar.emit(bytesReceived, self.file_size)
+        if self.file_size is not None:
+            self.update_status.emit("{:.1f} Mb / {:.1f} Mb".format(bytesReceived/10**6, self.file_size/10**6))
+            self.update_progress_bar.emit(bytesReceived, self.file_size)
+        else:
+            self.update_status.emit("{:.1f} Mb".format(bytesReceived/10**6))
 
 
     @Slot(QNetworkReply.NetworkError)
@@ -122,6 +140,22 @@ class UIDownloader(QObject):
             )
 
 
+    def _get_filesize(self, url):
+        """ Get the file size by sending a HEAD request to the URL.
+            If the Content-Length in HTTP headers is missing, returns None
+
+        Args:
+            url (str): URL to check the file size
+        """
+        try:
+            response = requests.get(url, stream=True)
+            size = int(response.headers.get('content-length'))
+            return size
+        except:
+            self.set_indeterminate_bar.emit()
+            return None
+
+
     def show_popup_error(self, error_msg):
         self._parent.dialog_popup(
             Messages.DIALOG_TYPE_ERROR,
diff --git a/ui/Downloader.qml b/ui/Downloader.qml
index 1fa57fe..039b574 100644
--- a/ui/Downloader.qml
+++ b/ui/Downloader.qml
@@ -29,6 +29,10 @@ Window {
         progressBar.to = bytesTotal
     }
 
+    function setIndeterminateBar() {
+        progressBar.indeterminate = true
+    }
+
     function updateStatus(arg) {
         progressLabel.text = arg
     }
@@ -51,6 +55,7 @@ Window {
                 Layout.rightMargin: 20
                 Layout.leftMargin: 20
                 Layout.fillWidth: true
+                indeterminate: false
                 value: 0
                 to: 0
             }
@@ -61,10 +66,11 @@ Window {
             }
 
             Button {
+                Layout.alignment: Qt.AlignHCenter | Qt.AlignBottom
                 text: qsTr("Abort")
                 icon.source: "qrc:/images/icons/abort.svg"
                 display: AbstractButton.TextBesideIcon
-                Layout.alignment: Qt.AlignHCenter | Qt.AlignBottom
+                flat: true
                 onClicked: { onAbort() }
             }
         }