Your license determines the products and features you can use. DRA requires a license key installed with the Administration Server.
After you install the Administration server, you may use the Health Check Utility to install a trial license key (TrialLicense.lic) that allows you to manage an unlimited number of user accounts and mailboxes for 30 days.
Refer to the product End User License Agreement (EULA) for additional information regarding license definition and restrictions.