Im trying to update my itunes but its keeps coming up with invaild signature. How do i fix it?

Im trying to update my itunes but it keeps saying invaild signature. How can i fix this? Its driving me mad

Assuming a PC restart does not fix the problem, the simplest thing is to get a friend to download the installer for you and put it on a memory stick.
This issue has been associated with router problems.
If a known good copy of the installer still gives the same error there may be a problem in Windows.

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