you can backup your save files and delete the previous version, then install the new version and copy the save files over.
Save file location: SD(or internal):/Android/data/bad.memories/files/saves/
ha thanks just did this and was about to comment the same thing. works fine.
Morales225286 use a file explorer to go to the location they stated /\ (i used es file explorer. copy the save files and put them in a back up folder then delete the game and install the new version. After that start the new game make a quick save and then go back to the file explorer and replace the new save files with your old backed up ones. Don't know how much of that was obvious wasn't intending to be condescending by just stating it all, but thought it better stated than not.