How to fix App not installed error in Android

This is usually caused when you have a debug apk that is signed with a different certificate and you are trying to install a release version with a different certificate. If you have a debug apk on the device try uninstalling it and try again.

For me, **disabling Google Play Protect** options from play store app worked , and i was able to get rid of the App not Installed error. Check the play protect option available in Google Play Store Navigation menu.