fix: Add shutdown helper call and modify exit behavior in updater

installer.iss

@@ -66,6 +66,15 @@ Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
 Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
 Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
 
+[Code]
+function PrepareToInstall(var NeedsRestart: Boolean): String;
+var
+  ResultCode: Integer;
+begin
+  Exec('taskkill', '/F /IM {#MyAppExeName}', '', SW_HIDE, ewWaitUntilTerminated, ResultCode);
+  Result := '';
+end;
+
 [Run]
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
 Filename: "{app}\{#MyAppExeName}"; Flags: nowait skipifnotsilent

src/utils/network/updater.py

@@ -1,4 +1,5 @@
 from network.direct_download.handle import DirectDownloadHandle
+from utils.general.shutdown import closehelper
 from utils.logging.logs import consoleLog
 from utils.data.state import state
 from PySide6.QtCore import Qt
@@ -91,6 +92,7 @@ def download_update(assets: list):
     progress.setValue(100)
     QtWidgets.QApplication.processEvents()
 
+    closehelper()
     subprocess.Popen([installer_path, "/VERYSILENT", "/SUPPRESSMSGBOXES", "/SP-", "/CLOSEAPPLICATIONS"])
     time.sleep(1)
-    sys.exit(0)
+    os._exit(0)