Devices get outdated after some time and Android versions they run, too. Make sure that the APK file isn’t corrupted or incomplete Why APK won’t install on Android?įirst, make sure that your Android version supports the APK version you want to install.Enable the installation from Unknown Sources.Make sure that you have enough storage space.Today, we’ll show you how to solve it with a few simple steps. Nonetheless, those who do, seemingly can’t install APK files on their Android devices. This error is not common for the mere reason that regular users rarely install apps from third-party sources to start with (even though APKs from the right sources are perfectly safe). One error that’s not common but plagues users is the App is not installed error that occurs when users try to sideload APK from external sources (not Play Store).