Note that the Dialogflow Trial Edition is a Dialogflow ES type of agent. Dialogflow ES and Dialogfow CX are two different virtual agent services, each of which has its own agent type, user interface, API, client libraries, and documentation. Therefore, it is not possible to upgrade from the Dialogflow ES Trial Edition to the CX Edition. You would have to recreate your ES agent in your new CX agent. More information in Edition comparison.