To install software anywhere else, you have to enable installation from third-party sources. But if you’ve probably already downloaded Android apps before. And even if you want to get software from the Play Store but have to download the APK manually to get around regional restrictions, you won’t be able to install it without enabling access to unknown sources.
You can get apps here wherever you are. To install from unknown sources in Android N and older, you can enable and disable the feature right from the settings panel. Open the App Drawer on your Android device, and tap on the “Settings” icon.
By default, the feature is disabled on your mobile. Users need to toggle-on the feature from Settings to start enjoying third-party Android applications. Turning this option on will let you install apps on your device from sources other than the Play Store.
You will have to confirm your action in a pop-up box. On some devices, you may need to slide a switch instead of checking a box. This format, an offspring of the JAR format used by Java, is a standard that includes all files needed to install an app from any device. Step 6: Tap on Toggle button Turn Off or On. That’s it now, you can accept third-party app from an unknown sources.
When enable unknown source on android Pie, you can download and install apps from external sources or apk files.