There's a new Airport support site at: www.airportforwindows.com. This site is maintained by Brian McWilliams, who was formerly active in Airport development and support, and has now returned after some real-world job changes, etc. The site will have all downloads. We're also going to maintain the site on flightsimnetwork as long as that's useful to users. Of course, this discussion site will stay.
The mirror site on Compuserve is no longer active. Compuserve changed their rules on filesize and I'm no longer able to post program upgrades.