Microsoft updates KB4512506 / KB4512486 are not available for Windows 7 SP1 / Windows 2008 R2 SP1 running Symantec Endpoint Protection or Norton Antivirus.
Microsoft has temporarily placed a safeguard hold on devices with an affected version of Symantec Antivirus or Norton Antivirus installed to prevent them from receiving this type of Windows update until a solution is available. We recommend that you do not manually install affected updates until a solution is available.
Guidance for Symantec customers can be found in the Symantec support article.
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