Windows 8 Key Only Upgrade - Jun 19, 2015 · I bought Windows 8 Pro and later I activated the free Windows 8 Media Center Pack upgrade, both being assigned to my Microsoft (live.ca) account.. The Pro upgrade accepts product keys from older business (Pro/Ultimate) versions of Windows. If you don't have a Pro product key and you want to buy one, you can click Go to the Store and purchase. How to install, reinstall, upgrade and activate Windows 10. Here's everything you need to know before you repair, reinstall, or upgrade Windows 10, including details about activation and product keys..