windows 7 key

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    Upgrading to Windows 10

    Hey guys, I decided to upgrade my computer to windows 10 but I don´t owe an active windows 7,8 or 8.1 key right now. Though I consider about buying an "old" unused windows 7 Key to upgrade to Windows 10. My Question is: Am I still able to upgrade to windows 10 with a valid windows 7 key?, or...