Ups, Sorry, forgot that people started using Vista
On Vista, there might be problems with running those old installers.
Here I've uploaded packed with WinRaR what is installed by the original program. Unpack it anywhere, than proceed with my previous instructions. If it won't work... than well not much more to do than to wait for one made specially to work with FSX+Vista configuration - there is one coming, but the time frame is unknown.