When the trial expires immediately, it is usually caused by some software running on your computer that it limiting access to the Windows Registry. Please disable any anti-malware, anti-virus, anti-anything that limits access to the Windows registry.
You also need to make sure that the user account that will use the software is the same user account that installed it.?Many of our plug-ins ship with Direct X presets for Vegas Pro FX. Because Direct X stores it’s presets under the User hive in the Windows Registry, they must be installed by the user account that will be using them. If the user account is not an administrator, temporarily make them an administrator to install and license the software by running it at least once. Then you can make them a regular user again.