Confirm the download finished
Remove incomplete copies and download the APK again from the maintained page.
Installation troubleshooting
Fix “App not installed”
Work through file completion, Android compatibility, storage, existing-package conflicts, and installer permissions in that order.
Ordered checks
Start with reversible fixes.
Retry after each step so you know which condition caused the error.
Check Android and storage
Use Android 5.0 or later and leave enough free space for the file and installation process.
Allow the correct source
Enable installation only for the browser or file manager used to open this APK.
Review an existing installation
A differently signed copy with the same package name can block installation over the current app.
Restart and retry once
Restart Android, reopen the complete APK, and read the system message before taking more disruptive steps.
Before uninstalling an existing copyUninstalling can remove local application data. Back up anything important and treat removal as a later step.