Sorry to dig this out, I was googling for it and found this thread.
What do you guys think the "Mac version" actually is?
I installed the free trial on Mac OS and browsed through the files.
This is literally nothing more but the Windows version bundled with Wine.
So you are paying for the exact game you already own and a wrapper that is actually free and open source.
Windows and Mac version should of been included within the price.
If they want you to pay seperately for it they should of made a native port.

Here's proof: