HT1926 Why ,when Itry to install the latest update for iTunes does it say that my iTunes signature is "invalid" when I have used this same computer for years and have installed all the previous updates? Thank you.

Why, when I try to install the latest iTunes update, itsays that I have an "invalid" signature...I have used this same machine and have installed all the previous updates with no problem.

That one suggests the installer has gotten 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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