Each installation of ArcGIS Workflow Manager Server requires an authorization file. You can register ArcGIS Workflow Manager Server using the Software Authorization Wizard that launches after the setup installation completes, or you can visit My Esri to obtain an authorization file (by email, fax, phone, or mail) before proceeding with the installation.
Registration requires an alphanumeric registration code similar in format to ABC123456789. Visit My Esri for more information.