If I purchased the latest version for the Mac do I get a Windows license and if so how do I get it?
No, they're separate licenses, although there is a bundle deal. If you bought the Mac licence from the Agile Web Store then you can just use the Upgrade to Windows option to get a discount (you don't need to upgrade to the bundle. That would give you 2 Mac Licenses + 1 Windows).
If you bought the Mac license from the Apple Store then email your receipt to [email protected] and they should be able to give you a discount code to use in the Agile Web Store.
What Richard said