It sounds like something went wrong with the download of either the game or the DLC. Can you download the game direct from here: https://ypressgames.itch.io/alpha-hole-prison Don't use butler or the Itch app and try again? If that doesn't work, redownload the DLC without using butler or the Itch app and see if that works. If neither works, let me know and I'll have our programmer look into it.