I knew you could select a different EXE for each mod by selecting it from the FSO Settings menu under each mod, but under the SCP's "mod" where you can download the newest EXE's, is it possible to have Knossos download any previous versions of a nightly EXE? I couldn't figure it out (or if it's even possible), so like I said, I did it manually. The latest nightly I currently see on the site is 9/10, so if there is one after 9/16 (the version that crashes), then it's not yet visible on the hard-light site after the site outage that happened a couple of weeks ago (and the SCP mod in Knossos isn't offering any new nightlies at the moment after 9/16).
Speaking of which, what happened to the hard-light.net site? Was the site moved to another server or did the server crash and have to be restored?