The Mac version is, of course, a separate download and separate purchase.
If you want the Mac version, I'd recommend you contact Adobe Customer Care and explain the situation. They'll likely refund your Windows version and arrange for your purchase of the Mac version.
After you get your refund for buying the wrong version, consider buying a boxed disc version from somewhere like B&H or Amazon. The boxed version is unique in that it comes with versions for both Apple and PC. You can install on one each.
I contacted the chat service, they gave me an alternative product code, so I could install the Mac version.
Great news, Sam!