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The upgrade itunes signature is invalid and cannot be installed.
1. First, click the Start button on the desktop and click the Control Panel option in the pop-up navigation bar.

2. After entering the control panel page, find the Internet option button and continue to click Enter.

3. After opening the Internet option, the Internet property page will appear. At this time, you need to click the advanced button at the top of the property page to enter the advanced settings page.

4. On the Advanced Settings page, find the option to check the signature of the downloader and uncheck the previous box.

5. Then, drop down the navigation bar of this page, find an option to allow running or installing software, even if the signature is invalid, put a tick in the dialog box in front of this option, and finally click OK at the bottom of the page.