If you're on PC, just download the new version, and run the .exe. All your saves will be there.
If you're on Android
1. Go to file manager
2. Go to "Android" file
3. Go to "data"
4. Go to "Harem Hotel"
5. Go to the saves file
6. You can either copy the save file as a whole or copy each file that is in the file
7. Create a new folder wherever you want (Not in Harem Hotel file) then paste it in there