Download vphone GagaHot to unasign apk? And what are things to do to make save login?
Download magisk
Download lsposed
Download corepatch
Download Google play games
Download the app from there and start it from there. You might have to click the "fix my problems" in game but it should log you into your save file
Download mod
Install it on top of the play version
Start the mod and you should still be logged in.