Heh, people trust the installer script?!
I unpack the .Z files to a directory tree, copy over the few bits that are not compressed (diskdoc, dacontrol, trackfile.device) and then run a oneliner that prints out md5sum of both installed and new files, and removes from update tree those that just duplicates of existing installed files (then another that compares version stringsā¦ just for heck of it). By doing it like this I get a better picture of what components really have changed since last update.