How can i get a licence number for the free triel desktop?

Thanks for using QuickBooks Desktop (QBDT), @andreiasemedo10.

Downloading QBDT free trial doesn't require a license number. You can use our software for free. This way, you'll know the ways of using the software before buying it. 

Here's an article you can check for more details in downloading our QBDT free trial: Download a trial of QuickBooks Desktop.

I'm also adding this great resource that you can read for future reference. This link provides detailed information on how to download and activate our official QBDT software: Download QuickBooks Desktop.

Tag me in if you have other concerns or questions. I'm always around to back you up. Keep safe and stay healthy.

I tried but it is not working without a license number and product number 

Thanks for getting back to us Manbari, can we check which trial version you're downloading from the link above, Pro, Premier, or Premier Accountant?