Yeah, cmdrovrbite pretty much nailed it. The two versions of the game are licensed separately, which means you cannot use the PC license you purchased to install on a Mac, or vice-versa.
I'm not an SI employee, but I don't believe that SI would allow you to "change licenses," simply because of the different licensing companies that they work with for the two products. You're welcome to try, but as cmdrovrbite mentioned, it's not very likely.
So, the other options cmdroverbite mentioned are about what you're faced with right now.
Thanks,
Steve
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