Unable to upgrade iTunes for Mac - Error message

Whenever the updater comes up, I am prompted to update iTunes. As it's going through the installation, it always stops and then I receive the following error:
The update "iTunes" can't be installed.
The source media you are installing from is damaged.
Try installing from a different copy of the source media or contact the manufacturer for a replacement.
I'm not certain what I should do and would appreciate any help you can offer.
Thank you.

I'm having a similar problem. The error message I received was: 'Installer could not validate the contents of the "CoreFP" package. Contact the software manufacturer for assistance.'
I only tried to update iTunes because for some reason my computer was not starting up and now it does not recognize that my iPod Nano is plugged in.
What to do?

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