It looks like a lot of people are having issues installing the full android version. 

If you know how to copy the demos backup data somewhere else then you should do that (Google it if you don't know how). 

The demo then needs to be uninstalled before installing the full version. If you open it just to the main menu then the folder will appear in android and you can copy the demo files over (saves will probably work? I just started over.)

this works. The app was hidden somewhere in my settings even though i though i deleted it. After officially uninstalling it, i was able to download it and play