I had someone email me recently that ordered proflightsim (digital version) and then subsequently discovered it was just FlightGear. 1. proflightsim is selling a download link to something that could be downloaded entirely for free. 2. This person contacted proflightsim for a refund, but received a reply that "due to the digital nature of your purchase, we are unable to offer a refund."
I notice that they have removed their claim of "100% rock solid guarantee", so they no longer promise to give refunds. Promising this and then not doing it was probably illegal in their country.
You don't know what you don't know, but if my advice to anyone who made a purchase with them, requests a refund, yet finds themselves in a similar situation: Open up a claim with your credit card company. You can claim the product is substantially different from what was advertised (misleading advertising.) My experience is that credit card disputes usually tip in favor of the consumer and not the seller. It takes some extra work on your part to get your money back, but in most cases it should be possible. In my view, the more disputes that stack up against this vendor, the better off the world will be. They aren't trying to serve the customer in any way, they just extract as much $$$ as possible and run.
Aerospace Engineering and Mechanics
University of Minnesota