Alongside iOS 5 beta and iTunes 10.3, Apple has also pushed iTunes 10.5 beta for Mac to developers. iTunes 10.5 beta is required to restore iOS 5 on iPhone,iPad or iPod Touch and sync iOS 5 devices. You can download iTunes 10.5 beta for mac from below..
iTunes 10.5 beta not only allows beta developers to Sync their favorite music, apps and to to iOS 5 devices, it also enables more iCloud-related features than iTunes 10.3. iTunes 10.5 also brings some minor graphics changes to better match Mac OS X Lion. You disable/enable Automatic Downloads form the Settings under a new preference panel.
Download iTunes 10.5 beta
If you’re a registered iOS developer, you can download iTunes 10.5 beta for Mac from the iOS Dev Center.
iTunes 10.3 is now available to general public. You can download iTunes 10.3 from here.