You have to download it. On the Atari forums is an exchange forum specifically for custom scenery(which includes the supports) You might want to check it out.
http://www.ataricommunity.com/forums/forumdisplay.php?f=406
This is Vortexian. Maybe some will know me from the RCT3 community, and some will know me from TPM (onride.be)
Well, I'm Dutch and ehhh... Can't think of anything useful right now