
Originally Posted by
oblio
To maybe be a bit clearer, you need the PC version for the PC and the Mac version for the Mac. You can't buy the PC version and install it on your Mac. My understanding is that the key you buy with the PC version will only set you up as a PC user when you register with Steam so you can't then download the Mac version from Steam uisngthe PC code.
However, rather than buy from Amazon, just buy what you need from Steam (1 Mac, 1 PC) and save money when the game is on sale.