Applicable toWindowsThe August 2019 update summary of 7 is issued only through SHA-2, and devices equipped with signature support software that cannot handle SHA-2 codes will be prevented from updating. Today Microsoft has confirmed that it will prevent PC upgrades that install Symantec Antivirus and Norton Antivirus anti-virus products because they cannot handle SHA-2 certificates.
Microsoft said it had temporarily protected devices with incompatible versions of Symantec software. Symantec recorded this question: "When installing some versions of Symantec Endpoint Protection, only SHA-2 signature updates are not visible for download."
Microsoft recommends that Windows 7 users manually install new updates before solving this problem. If you force updates, anti-virus programs may block or delete Windows updates during installation. This may damage the installation of Windows, or the system may not start.
Microsoft said: "Microsoft has temporarily secured devices installed with affected versions of Syntec Antivirus or Norton Antivirus to prevent them from receiving such Windows updates until a solution is found."