I always install the latest version, which is 4.0.3 for 68k Macs and 6.0.3 for PowerPCs (OS 9) - is there any reason why you would use a version lower than the maximum for your Mac? I always assumed it was best to use the newest one as QT seems to be more of a core OS component on the Mac, not just a media player, and it tends to be best to update the OS core as much as possible. I always remove the FireWire extensions and things like that which come with the later versions and aren't needed on older Macs.

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Apparently, it's ok to have more than one version installed. On my beige G3, I've got version 2.5 (for full-screen playback of movies, as well as its many transcoding options), and also whatever QT version was installed with OS9.1. They happily coexist, as far as I can tell. I use 2.5 to convert movies into Cinepak (for playback on 68k machines), and MPEG1 (for lower-end PPCs).

Having only, say, 4.0.3 locks you out of many of these options. As I mentioned in my earlier post, Apple *removed* these features from later free versions.