Are you referring to me or Nick? I was trying to get Kismac to run on 10.4, and then I jumped up to 10.4.3. Nick was the one running 10.4.2. I grabbed the r75 version from the kismac site through a link from a post on the internet somewhere. The poster mentioned that they got it from the mailing list, so you should be able to find it looking back through the archives.
I don't know what went on when I updated the system, since the 10.4 HD was the way it came from Apple (no apps installed except kismac when I initially tried).
Interesting. I seem to have a similler problem that you had 10.4.2, however for some reason even when I updated to 10.4.3 kismac still tries to load a driver takes me to a admin something password wanting window and then tells me airportdrivers not found. I had this in both r75 and r76 both built from source. I am cerious what your (or I suppose anyone-elses opnion is) if it's something whacked in kismac, or osx. Did you build it from source? Or use something premade someplace? I ask because I'm realy cerious.