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Upgrade to Windows 8 with only a product key - Microsoft Windows
Learn how to download and install Windows 8 in a few steps by using just a product key.
Install, upgrade, &activate - Microsoft Windows Help
Get help with installing, upgrading, and activating Windows, including info about product keys, registration, and transferring files.
What is a product key?
Get a brief explanation about your product key and where to find it.
Add features - Microsoft Windows
Add Windows Media Center to Windows 8 so you can watch and record live TV. Get Windows 8 Pro pack or Windows 8 Media Center Pack.
Add features to Windows 8: FAQ - Microsoft Windows Help
Get answers to questions about how to use Add features to Windows 8, including how much it costs and where to get a product key.