Install Windows 8.1 on Windows 8 Pro with Media center addon key

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http://superuser.com – This question has been asked earler in this forum but a clear answer for the same is not yet available for the people who bought windows 8 pro upgrade I purchased Windows 8 pro upgrade from Win 7 ($40 Win upgrade offer) also I got a free Windows Media Center Addon Pack key.... Currently Mys system is : Windows 8 Pro with Media Center After reading other questions i found that to install Windows 8.1 standalone i have 2 options Windows Store MSDN/Torrent iso download and use a defualt key to install So i have with me : Windows 8 Pro Key Media Center Addon Key Torrent to Untouched ISO ( (HowTos)