Along with the actual release of the public version of Mac OS X Yosemite, Apple has pushed iTunes 12.0.1. The update, available for users who have upgraded to Mac OS X Yosemite, brings iTunes to version 12. The update is available through the Mac App Store on the Mac, or you can download it directly from Apple’s website.
Additionally, Apple has now released iTunes 12.0.1 for Windows.
The Cupertino corporation has also just pushed Security Update 2014-005 for Mac OS X Mavericks.