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.

With Family Link

1
Select your child.
2
Tap Controls Account settings Controls for third-party apps.
3
Select the level of control for third-party apps.
4
To review which sites and apps have access, select Manage third-party app access.