Bro just enter the game and the game show: download in appropriate store and then minimise the game for some time and enter the game again and click retry now you can play but you have no access to mod
If App Crashes on Start up:
Enable Permissions for Storage & Phone
If App is in a White screen:
Clear Cache and force stop the app.
If App is detected as Unauthorized or modified:
Force Close the game!
Clear Cache, Force stop and if it's still not working unallow all permissions and reallow.
If app isn't downloading:
Make sure to install
SIGNED: If you don't have rooted device. If you don't know what root is you probably don't have root so install this one.
UNSIGNED: If you have root + LuckPatch Patchers installed.
If you don't know if you have root or not, most likely you don't have root.
(Thanks to @Anitakawaii for sharing his/her experience)