You can try and type that key in, there are usually 2 numbers on the sticker you want the one that's equal numbered blocks..
I bet it will not work, they probably used a corporate / msdn key to upgrade or install windows 10... So your pc's w7 key was never used to upgrade to 10... And they stopped the free upgrade a few months ago
Yeah you're right, it doesn't work. Unable to activate. Bah. Their store offers Windows 10 Pro for workstations, £149.
So if I buy this, will it work? Is this what I need, an OEM key? https://www.amazon.co.uk/Windows-Pr...qid=1521545497&sr=8-2&keywords=windows+10+pro