You have to follow a little bread crumb trail through their website to activate the demo.
I had to completely map every control... It defaulted to my pedals controlling the ailerons and elevator. When I mapped my stick and pedals, I had to invert the rudder input to have it work correctly... haven't figured out the viewing system yet.
But boy is it pretty. I mean, wow. My computer isn't anything super, but I have a good frame rate and the trees would be an AH gv'ers wet dream. Definitely worth the download trouble. Maybe it will be my christmas present.