15 days ago
NEWER UPDATE: My refund request is accepted.
UPDATE: I've updated Windows 10 to the current version, but the key still doesn't work.
As you can see in my profile, recently I have built my troublesome "The Funstation" PC build. It is about to get even more troublesome. Today, I am installing my Windows 10 Pro license. I bought it on Amazon for $99.99 CAD (it said it was used but like new). It looked legit. However, it arrived in an envelope with just a USB and an activation code. The installation process went normally, however, after it installed, it was a version of Windows 10 Pro that dates back to July 2015 Updating through Settings does not work, I keep getting an error code (I will provide that too if necessary), and "fixes" for it that I searched online does not work. The only way I could update Windows was through the update device creation utility on Microsoft's website. Finally, the code was on a seeming legit code thing. However, it doesn't work. On the activation page, it said "This code was removed from our activation servers."
Now, is this copy of Windows legit, and what should I do if it isn't?