I updated to the latest patch yesterday. Afterwards, when trying to play the campaign mode, I received the error, "The original Age of Empires III cannot be played while Wars of Liberty is installed". I uninstalled the steam Age of Empires III version and relaunched Wars of Liberty. The game asked me for my Product Key and when I entered it, the game says my product key is invalid. However, I know the key is legitimate because I purchased the game and steam keeps a copy that I use. I re-installed the steam version and Wars of Liberty worked, however with no campaign mode. Any thoughts on how this can be corrected?