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How to Install Apps From Unknown Sources on Android
1
From a Home screen, swipe up or down from the center of the display to access the apps screen.
2
Navigate: Settings Settings icon > Apps.
3
Tap Menu icon (upper-right). ( ...
4
Tap Special access.
5
Tap Install unknown apps.
Corrupted or incomplete APK files:\n\n This can occur when downloading or transferring data. To fix this issue, download the APK file again from a trusted source and make sure the file is ready before installing.