Download the game save backup at Download files and extract it.
Delete and reinstall the app.
Logout of Game Center, Open the app till you get to the menu, then close the app from the multitask.
Put the documents folder in the 「TWD2/Library/Preferences/」 using (iFile, DiskAid, iFunBox...) or other apps.
It will ask you to replace the old documents folder, do so.
Launch the game and don't load save from iCloud.