When installing apps on Android, users may encounter some problems. For example, the “App not installed” warning can be caused by a number of different reasons. These include corrupted file downloads, incompatibility between Android versions and apps, lack of free memory available on the device to complete the download, or in some cases your smartphone has may prevent app installation from its protection programs, such as Google Play Protect.
Below, you can check out some of the top reasons.
1. Free up mobile phone memory space
2. Version not compatible with the system
3. Reset app preferences
4. Turn off Play Protect
5. Allow installation of apps from unknown sources