Hi @2000darshansaini, as I remembered, the trial period includes a small number of executions with TestCloud. Did you try to click on the Enable Katalon TesCloud integration, and the error showed up?
You can leverage this program in the community to get free license though: [Kudos Rewards Update] – A New Chapter For Our Community
In the next version of the program, we will allow multiple paths to reduce dependency on different solutions.