Don't judge immediately if your key does not work
I was a bit dismayed initially when my product key did not work and thought I was going to end up being ripped off. This was not the case as the next day customer service took the time to go through some additional steps and make sure Windows 10 was activated. This only took a few minutes so I suggest if you are going to use recycled software have a little bit of patience they will make sure things are right!