OK, let's take a step back and check a couple of things.
1. What operating system are you installing the trial edition of Ghost on?
2. Are you installing Ghost Solution Suite 11.5 ? Have you tried a second download in case there was a problem with any of the files in your original download? If you are testing the version of Ghost that ships in the DS software deployment tool, then the GSS trial license would not be compatible.
There are contact details for tech support in one of the sticky postings at the top of this forum - specifically the one about Ghost patches. If this problem persists then perhaps a call to them would get a solution quicker.