TS2363 Upgrading itunes from 11.0.1.12 to the latest version

when I try  update itunes in the middle of the process received a message that shared files has not valid signature. Could you help me, please?

That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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