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I did this today, as I have a very strong computer, and have yet to finish my water cooled monster machine. It had Windows 7Pro, which I really liked, but I could not resist this article I read on CNET.
I did it, it worked. My computer went from 7Pro to Windows10 Pro without a glitch. It has, for a license, what's called a "Digital Entitlement Key". I can do any update and hardware change, but like any OEM edition of Windows, if I change the motherboard, I have to buy W10 again. That was the way it was with the edition of W7Pro I had. It worked flawlessly, saving everything, I lost no data, it's all there. Just follow the simple instructions. I put the file on a slaved hard drive, and it changed W7Pro that was on C: drive. Make sure you chose the option to install the program on your machine.