The itunes update shows that the signature is invalid and not installed. - Quotes Website

The itunes update shows that the signature is invalid and not installed.

When I made this mistake, I tried a method.

Actually, the file has been downloaded, so don't click OK.

Open C:\Users\ your user name \AppData\Local\Apple\Apple.

software

update

There is an installation package under this folder. Just click Install.

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