fs2x_WAAS GPS V2 by Don Kuhn: how does it work?

Anybody ever used the fs2x_WAAS GPS V2 you can download on this site?http://www.fs2x.com/Freeware.htmI am trying to use it but absolutely NOTHING works as the User Guide says it should. Everytime I press a button it seems to do something different. Which usually is nothing at all. When at last I am able to activate the cursor to enter data (without knowing how I did that), I can't enter data at all (not by scrolling and not by using the keyboard, as it should according to the guide). Everything seems to work at random.In short: it simply doesn't work. I wonder if it does work for someone and maybe that someone can help explain me the basics...