Since you gave more details, we could check it out and the outcome is: you gave us your professional email address and we sent your license to it. So, from our perspective, it looks like a successfully completed transaction. As you have confirmed, you even received the invoice. You never came back with any complaints, so my guess is that you received your license. Now, 4 years later, you are saying that the license was not working. What was the problem and why did you never contact us?