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I just installed Windows 8.1 Pro as an upgrade from an ISO torrent. I was able to activate my original Windows 8 key successfully. However, I tried to activate my Media Center Pack key that I purchased for Windows 8 and it errors out the first try. When I try to activate it again, it then says "This key won't work. Check it and try again, or try a different key.". Do I have to purchase the key again?

Thanks

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Did you use a Generic license to do the upgrade. You really should have use the Windows Store in order apply the update. There is a solution but it requires your original Windows 8 Professional license key. –  Ramhound Oct 20 '13 at 21:25
    
@Ramhound Yes, I used a generic license. I have my original Windows 8 Professional key. –  Daniel Oct 20 '13 at 21:35
    
I posted and answer with the information you seek with RTM in the title. After you activate your Professional key again you have to upgrade to MC again –  Ramhound Oct 21 '13 at 0:26

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