STAY AWAY!
The key they gave me was blocked by Microsoft because it was "abused" or overused. I suspect they are simply selling keys, hoping they will work. When blocked by Microsoft, too bad for you. So far, I'm out 140 bucks.
I had SoftwareMart and microsoft on chat at the same time. The SoftwareMart person would NOT chat with the Microsoft support. I wonder why?
Thankfully, Microsoft actually took pity on me and supplied me with a legit key! Hooray. Microsoft has lodged a complaint against them. Whatever that will do.