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Actually it works on Win/Mac, the application it's still in beta so if you find any bugs feel free report them!

Does the download button at the top change based on the users OS?

yes it does. but you can find all the available platforms at the bottom of the page.

It says "For Windows 7 and above" under the top download button while it says "For Windows XP and above" on the other two.

> Actually it works on Win/Mac ...

So change your landing page -- it detects the user's platform and makes a guess. Visitors running Linux see a Macintosh icon.