First, as all our products are available in Trial version, and this is clearly indicated on all products pages and all our FAQ page, you can't say you "paid 40$ for something you can't use", because the whole point of having a Trial version, is to allow you to check you CAN use something, BEFORE purchasing it.
Surely the problem wasn't "caused" by GSX, but something else, but it's not possible to help you if your description of the problem is so generic. You can't just say "fatal errors", without specifying exactly what the error was: how are we supposed to help you, if we don't even know what the problem is ?
So, let's start from the beginning, and clearly indicate what errors you are getting. Precisely.