The download does not start
Check the connection and whether the browser is asking you to confirm a download. Return to the designated entry once, then look at the browser’s Downloads list. Avoid starting several copies.
The file is incomplete or missing
Check Downloads in the browser and the Files app. If an entry is marked incomplete, resolve the connection or storage issue before trying again. Do not install a file while it is still downloading.
Android says “App not installed”
Check available storage and confirm that the file finished downloading. Read any additional explanation shown by Android. If an older installation is present, review the update guide before removing it.
There is a package or security warning
Keep the warning visible long enough to read it. A source, signing or compatibility issue needs a different response from a storage issue. Follow the file-verification guide; do not bypass security checks.
The app will not open or connect
Close and reopen the app, check the network connection and restart the phone if needed. Check whether the app displays an update or service message. Avoid clearing app data until you know how to restore account access.