If you have an older version installed, please copy your save files somewhere, uninstall the old version, then install the new one. Lastly, just place your save files back.
How do I find the save file? There's no way to access the files of the game that I can see. Had the same issue with another game recently. Not exactly sure why this has become an issue. Also I would just attempt to Uninstall the current version and download the new one, but I feel like I might run into the same issue as the other game. Won't load as there's no save file from the previous version. I'm just trying to make sure you understand, as from what I can see there's 0 way to get into the files through normal methods, and there's no option in game to copy save files.