You have to make an account with kefir you can do it from the settings page
I'm connected so it says disconnect
View attachment 694332
Tap that button and it will take you to your default web browser and you can register with your Google account
Once registered and your game is connected to kefir
You can then safely uninstall
You then install either version and connect to kefir
When you tap on return to game it does so and a pop up appears to confirm game restore