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

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?