Hello! Due to an error in my part some people got the base game plus the art pack DLC for free. The error has been fixed on Steam's side so that people won't be getting the DLC for free anymore, but I am working with Steam to see if I can get the DLC for the people who already got it for free during this period, since the DLC might disappear now that the situation is fixed. Please be patient as I talk with Steam about this. Thank you and enjoy the game!