Can u search for the games folder in ur phone, or is it not showing . If not install 'solid explorer' its a file manager and in that u can just search in ur internal memory - android folder , in that in media or obb i guess there will be the game folder . There u can just find the save files. Just copy that saves including persistent file cause that shows the gallery. So after copying it just paste it somewhere else which is easy for u to find . Like create a new folder or such. And then install the new version . Then start the game and just exit the game and then agin go to 'solid explorer' then find and copy that save files into the new version's save game folder. Done u r good to go.