It seems GSX doesn't work in Trial, which doesn't have anything to do with activation, it simply means the software hasn't started. As explained in the sticky thread in this same section of the forum, if the software is not running, do all the following:
- Configure the antivirus to add the whole Addon Manager folder to the Exclusions
- Be sure your firewall is not blocking online access to the FSDT Live Update.
- Download and install the new FSDT Universal Installer and use that one to do an update.