Upgrading from Home Premium NOT Working - Windows Anytime Upgrade. I'm trying to upgrade from Home Premium to Professional through Windows Anytime Upgrade, I bought the Key etc through the "Windows Anytime Upgrade" but when it got to the last step its suddenly saying that the key is not valid. I tried restarting and it still won't work. Why is this not working. EDIT: I have double even triple-checked that I am putting the right key in. That's not the problem. 3 people had this question.
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