I am trying to enter my license key and site message. I am able to enter my license key without any problems, but it will not allow me to enter my site message. It just says 'Trial Version' for the site message and the field is not editable. If I click to apply it, I get a “License key or site message invalid” message.
A commercial key will not work in a trial version.
Un-install the trial version and install the commercial version.