The full instructions on how to activate your free copy of Media Center Pack for Windows 8 Pro follows:
To get started Head over to http://windows.microsoft.com/en-us/windows-8/feature-packs and enter your email address along with the CAPTCHA code for verification. The product key will be emailed to you.
- Go to the Start Screen and type “add features” and tap/click on “Settings”.
- Tap/click on “Add features to Windows 8” and select “I want to buy a product key online,” if you want to purchase a product key. You can select “I already have a product key” if you want.
- Enter the product key provided to you, then select “Next”.
- You will be prompted to Add Features, and once you do the product will be installed.