I have the Steam version and have tried restarting and updating the games multiple times, however nothing has worked so far. Did not want to place spoiler comments there.
Try finding the save file and delete it? It might be somewhere here> C:\Users\YOUR USER NAME HERE\Saved Games or here> C:\Users\YOUR USER NAME HERE\AppData\Local or here?> C:\Users\YOUR USER NAME HERE\AppData\Roaming
