The trial versions of Deskpro On-Premise and Cloud work just like a paid version.

The one exception is that on Deskpro Cloud trials, the function to import your user records as a CSV file is disabled to avoid abuse by spammers.

At any time you can buy a license and convert your trial to a full version, keeping any data and configuration changes you have made - although if you want to delete some or all of your test data, you can - see How do I delete all my test tickets?