It seems like there are customizations beyond that. On my G4-upgraded B&W, Software Update offers a 22.9 MB file. On my PowerBook, it offered a 27 MB file. And, the web download (Standalone Installer) is 43 MB. The originator of this thread, Spoonbender, reported using Software Update and that the file offered was the full 43 MB. So, there must be some differentiation in the update based on what Software Update finds on the local machine. I think the considerable pause before reporting what updates are available is additional evidence in support of this theory. Moreover, Apple say as much, here: <http://docs.info.apple.com/article.html?artnum=25799> On Aug 10, 2004, at 1:05 AM, Eugene Lee wrote: > I doubt it. I think it's a simple case based on what Judi reported. > She is doing a 10.3.3-to-10.3.5 upgrade. The smaller updater works > only for 10.3.4-to-10.3.5, while the larger combo updater handles all > previous versions of Panther.