Subject is a B&W G3 running 10.4.11, just installed over 10.3.9 so it was actually installed as an "upgrade" instead of a full install.
Problem is with trying to install either of two music scheduling programs, MegaSeg or RadioLogic DJ. I get the following errors when I try to launch them:
Both were downloaded with Safari and unpacked with Archive unpack or whatever the Apple utility for this is. I've run disk utility and repaired permissions. I haven't yet tried to install anything else.