My computer came with Windows 10 Home, which I promptly upgraded to Pro. I recently upgraded to Education from Pro using my school's DreamSpark Premium program. However, now I want to know how to go back to Pro. I tried the product key that came from ProduKey, but that resulted in Error 0xc004f014. (Not sure what that means, that's all it gave me.) Anyway, I know the key ProduKey gave me is generic and that what really matters is that Pro was activated on Microsoft's servers.
Here's a screenshot of ProduKey (private info redacted). The highlighted entry contains the key I was trying to put in.