ITunes upgrade won't download due to 'invalid signature'

I have a 2nd Generation iPod Touch which will not download any iTunes software upgrades when prompted to do so.  The first error message advised me to go to Tools, then Download Only (which I did).  The next error message said that iTunes has an invalid signature.
There is a very useful health related app I want to use but my software needs to be upgraded first.  Can anyone help me please?
Thanks very much, NathalieS

I would delete the download and redownload the updat file.  It is located here for a PC
ipsw location
For a Mac you the Fibder search and search for *.ipsw

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