iTunes update 10.6.3
I am also having issues with this update. When I try to open iTunes, the dialogue box tells me the "iTunes Library.itl" can not be accessed because it was created in a newer version of iTunes (I recently transfered from a 2.5yr MacBook Pro, to a 6month MacBook Pro). I am then promoted to download an update for iTunes. When I go to install this update, I am informed that the update can not be installed 😕 because "The update could not be verified. It may have been corrupted during downloading. The update will be downloaded and checked again the next time that Software Update runs." 🙁
So currently, I can not use iTunes at all 😡