HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedNov 24, 2012 2:45 PM (in response to riverwildlife)
Purchase a Mac OS X 10.5 DVD from a source such as Amazon or eBay.
Currently Being ModeratedNov 24, 2012 2:47 PM (in response to riverwildlife)
You would need to upgrade your G5 to Leopard, or upgrade your hardware.
iTunes 10.6.3 is the last version of iTunes to support Mac computers with Mac OS X 10.5.8 with either Intel or PowerPC processors.
iTunes 10.6.3 for Mac (Leopard or later):MacBooks iMacs iPods AirPorts, OS X Mountain Lion, 27 years Apple!