Do not use PVPBoost, aka ‘Shoukin’, and also using several other website iterations, as they are blatant and verifiable scammers. They take money for fake and invalid product keys, then hiding behind an automated message generating site, ignore any pursuit of the matter. Do not trust this company and do not provide them with a payment.
Key sent doesn’t work, Microsoft reported it as a ‘used/already activated’ key. Messages sent to this effect have been fastidiously ignored. Initial ‘Confirmation’ email was sent from an automated message generating site, which the company is clearly hiding behind. I’m only out of pocket by £2.50 sterling, but scale that up to hundreds of thousands of scammed buyers and this company is laughing all the way to their bank, whichever country that might be in. As you might imagine, my advice is to avoid this company like the plague.