V2 licenses are cross platform - you receive both the Windows and the Mac version installers and the same license key can be used with either or both of them.

If you have purchased the v2 Windows version previously and want to use the Mac version now, you don't need to purchase a new license, visit this page to get the Mac version using your existing v2 license key.

The upgrade version requires a v1 license key in addition to the v2 license key that you will receive, you can order this version if you already own v1.