HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedOct 3, 2012 9:38 AM (in response to stavrosthegreek)
You're saying that there is an issue when trying to use Software Update to get to 10.6.8, correct? An alternate way to apply that update is to download the 10.6.8 update from the Apple download site.
Before running it, bring up Disk Utility, repair permissions, apply the update, and repair permissions again when done. With that, you can now install iTunes 7.