If you are on a playstore or emulator and aren't sure where to get the 2.0 update you can go to the discord server and in info tab you can find how to access it, I bought it on playstore on my phone and then downloaded the apk for bluestacks (Provided in the discord server), used restore purchase when clicking on the right side menu and now I have full 2.0 version on bluestacks, my guess is it will work similarly on your actual phone.
Do be careful though, save files might have some issues since you also have to delete old version of the game if you have it installed