Well, in this case they use Paypal for payments, and I used my Paypal account, so I got the receipt just fine, but never got the license key. So the possibility

Well, in this case they use Paypal for payments, and I used my Paypal account, so I got the receipt just fine, but never got the license key. So the possibility of "I gave them the wrong email address" never entered my mind for me to double-check.