We have a substantial collection of tracks that we have collected over the years. We are working on a new way of displaying them within the game so that they can be browsed and easily downloaded.
In the meantime you can access the tracks from here:
*Just move the track file into your tracks folder.
This is normally:
C:\Program Files (x86)\HoverNet\tracks
Alternatively you can download the full tracks collection by clicking here (143MB)