I'm curious why downloads are available in some posts, but not others. For some posts, there is just a link which starts the QuickTime plugin in Safari, so I can play the piece, but not save it to my disk.
I assume you refer to the Audition Room ?
As soon as recordings are put up the site, we replace the uploaded attachments by links to the recordings, to conserve disk space and keep the Audition Roon tidy. You can still save these to your disl of course, but how exactly depends on your browser. Usually something like right mouse click and then 'Save target as...'.