As part of the Android Operative system, there is a restriction that blocks installing applications outside of the Google Play Store.
There is a way to allow the installation of third-party APK files without going through the Play store, though it will require some configuration on your part. If you run an APK on your device without first enabling the feature, you will see the following on your screen.
As you can see, it says your phone is set to block apps from “unknown sources.” The “unknown sources” term means anything other than the official Play Store. So, how do you go about overcoming this prompt and enabling the non-store apps to install on your device?
1 – Open the App on your Android device, and tap on the SETTINGS.
2 – Check the option Allow from this source and the feature will be enabled on your device.
3 – Now, tap on INSTALL on your device, and you should see that it installs without any issues
4 – The feature should now be enabled on your device, and you may now exit out of the settings menu.