Domain name change on trial version

Hi, I am trying to change the name of my domain while using the trial version of Boonex Dolphin. I've changed the name in the inc.header.inc.php and cleared the cache, public_cache and tmp files, but as I am on a trial version, there is no license for me to alter the domain name and I can't find anywhere in the admin panel to change it. The domain name change in cpanel just results in a blank screen. What stage am I missing out? Help would be greatly appreciated. 

Maybe the issue is your browser has cached the old domain.  If you have been using the site for awhile and there is indexed content in the search engines, you will want to set up a domain redirect.

There is no need to worry about not having a license, that has nothing to do with changing the domain name.

Thank you, I'm intending to set up a redirect when I manage to effect the change. I'll see if I can clear the cache of my browser. Thank you.