Okay, here's what's up. My friend just bought a pretty clean G3 iBook that currently is running Tiger. he wants to hook up his iPhone to his laptop, but iTunes wants him to have Leopard in order for it to see his 3G iPhone. so my friend downloaded the Leopard update but when he tried to run the update, the laptop gave him some sort of error that says, "installer package cannot be used ......................" can anyone throw me a lifeline or two as to what the problem is? he really wants to run Leopard but so far he isn't having any luck.