Please can this get fixed or can I get a refund?
Refund of what, exactly? This error (you said you have the "SAME error") posted here, it's related to a very specific case, which is installing GSX IN TRIAL, meaning you haven't bought GSX and are installing in Trial because you have another FSDT scenery active.
And, we have the Trial files not updated to the latest version but, of course, it's fixed now.
That it, assuming you really have "the same error", which I can't be sure of because, opposite to other that all have posted their error log, allowing to understand the problem and fix it, you haven't, so I really can't say for sure if your problem was the one that has been discussed here, that was related JUST with the TRIAL version.