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Edit: I am unfamiliar with that site, but so long as it's a reputable seller, you would get a key for the complete edition that activates on Steam.
That said. The disc will include a Steam key that you can simply activate. It can be that you have to activate it on a Windows PC, as it's the Windows version you bought.
After activation, you get the Linux and Mac versions available as well, since it's SteamPlay.