Hey there, GvanVuur.
Thanks for following up on this thread. I'd be glad to lend a hand with your question about the license number.
The license number of your QuickBooks Desktop account is different from your order confirmation number. If you're able to open your account, you can press F2 on your keyboard to see the license number.
This information can also be accessed by clicking the Help tab at the top of the page, then choose About QuickBooks.
Additionally, if you purchased QuickBooks in a physical retail location, the license number will be listed on the packaging. If you purchased your product online, the license number will be included in the confirmation email.
Keep up the great work and feel free to comment below if you have any other questions.