When i try to update iTunes (on my MacBook), I always get an error

Hello, each time I want to download the update for iTunes on my MacBook Pro, the process stops at some point because of an "unexpected error". What can I do?

1) Make sure your computer is backed up before doing any update. If you update iTunes and don't like the new version you cannot back out unless you have a 100% clone of your computer.  Also updates have on rare occasion been associated with making computers crash.
2) Run Disk Utility to verify your drive.  If it reports no issues, run the repair permissions features. If there are issues then you need to boot from the installer disc and repair the drive.  Do not install updates on a computer with drive issues.
3) Download the new iTunes version from the Apple web site.  This often gets around Software Update issues.
4) Install new software, then repair permissions again afterward.
5) Check that everything is as you like it.

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