Yesterday when we shipped Steam on the Mac, previous owners of the PC Steam version of Sid Meier's Civilization IV, Civilization IV: Beyond the Sword Sid Meier's Civilization IV: Colonization , or Sid Meier's Civilization IV: The Complete Edition did not have access to their games when logging in on a Mac.But as of now, upon logging into Steam, those owners will have access to the Mac version of their games, right in their Steam library.