"App not installed" on Android: How to Fix It

The official app is already installed

A modified build usually keeps the official package name but is signed with a different key, and Android won't install one over the other. Uninstall the official app first.

Uninstalling removes the app's local data — offline downloads, watch history kept on the device, guest progress. Save anything you need first.

Another modified version is installed

A MOD of the same app from another site is signed with yet another key, so it blocks the install the same way. Uninstall it first — Android checks the signature, not where the file came from.

A newer version is already installed

Android won't replace an app with an older version (a lower version code), even from the same source. Uninstall the newer copy first, or download the latest version from the app page.

Your Android version is too old

When App Info on the app page lists "Android X+" under Requires, phones on an older Android version can't install that build.

The build is 64-bit only

When Requires says "arm64-v8a only", the build has no 32-bit code and won't install on a 32-bit phone — mostly older or entry-level models. A device-info app shows which one you have.

Not enough storage

Free up space — installation needs roughly twice the APK size while unpacking.

Incomplete download

Re-download from another mirror. A truncated file fails near the end of installation.