That same update applies for G4 867 Mhz, and 1 Ghz G4 and G5 Macs that have software that isn't compatible with Mac OS X 10.5. Upgrading to 10.4.11 using this link for G3s and G4s first is necessary before updating your iTunes, and you should backup your data before anything is installed: If you have one of those machines with an older version of 10.4 (10.4.1, and 10.4.2 are older), 10.4.11 is the latest operating system for Firewire capable Macs with PowerPC G3, G4 800 Mhz dual processor or less. ITunes 9.2.1 - is the latest iTunes for Mac OS X 10.4.11.
