Play Act 1 First, and then make sure to save at the end of Act 1 (Uninstall Act 1 after this)
Download Act 2 and then install it, and then download the rpa of Act 2, place it inside Documents/BE/be.ataegina/game, place the rpa inside the game folder, and then open Act 2, and just before you press start in Act 2, turn off GL2 on options/preferences and restart the game.
Check if there is an .RPA file and an .APK file in your download folder, RPA is the big one, APK is the small one.
Move/copy the assets (.rpa) file to Android/data/ org.ataegina2.the66/files/game folder (if you have android 10 or older) or RenPy/org.ataegina2.the66/game folder (if you have android 11 or newer)