Manual installation of an APK requires granting "Unknown Sources" or "Install Unknown Apps" permissions in Android system settings.
While APK files for various versions (including later versions like 5.11.3.5) are still hosted on third-party repositories like Uptodown , the app's functionality is severely limited: Couples [v0.5 SE] [APK]
Official support and software updates have ceased entirely. Manual installation of an APK requires granting "Unknown