Well, you can get the official version off Steam. But it won't support the mod, obviously. I've experimented with Crossover Games to no avail, so your best shot is to use Parallels or Bootcamp with XP or another lightweight Windows and stick to that. I have an MBP 2010 17" + a 22" Asus TFT screen, I run parallels on the second screen in a window so I can play anytime I want.