AirTrack and its plugin run on the Steam Edition of FSX.

The installation process may vary depending on individual systems, but in general proceed as follows:

1. Download AirTrack-FSX-v1.6.zip from http://haversine.com/airtrack/downloads

2. Run the installer

3. When told that FSX cannot be found and prompted for its location, browse through to its location which should be something similar to:

C:\Program Files(x86)\Steam\steamapps\common\FSX

4. Finish the install

5. Launch FSX, select your plane

6. Switch to 2D cockpit view once to launch the gauge/plugin. You should see the AirTrack icon on the top-left corner of the screen for 1 minute

And that's it,
fun flights,
joao @ haversine