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KB4521864 Servicing stack update for Windows 8.1 - Oct. 8


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Servicing stack update for Windows 8.1, RT 8.1, and Server 2012 R2: October 8, 2019

Applies to: Windows Server 2012 R2, Windows 8.1, Windows RT 8.1


Summary

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Key changes include the following:

  • Improves the Secure Boot revocation list (DBX) update experience to avoid multiple restarts when you deploy the DBX update on a device where the Credential Guard service is not running.
  • Addresses an issue in which the Secure Boot revocation list (DBX) is not applied when the Secure Boot allow list (DB) update is empty.
We strongly recommend you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). Installing servicing stack updates (SSU) makes sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft security fixes.

How to get this update

Method 1: Windows Update

This update is available through Windows Update. It will be downloaded and installed automatically. 

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Method 3: Windows Server Update Services

This update is also available through Windows Server Update Services (WSUS).

Prerequisites

There are no prerequisites to apply this update.

Restart information

You don't have to restart your computer after you apply this update.

Update replacement information

This update replaces the previously released update KB 4512938.

Source: https://support.microsoft.com/en-us...-installing-windows-8-1-rt-8-1-server-2012-r2


Direct download links for KB4521864 MSU file from Microsoft Update Catalog:

:arrow: Download KB4521864 MSU for Windows 8.1 32-bit (x86) - 4.8 MB

:arrow: Download KB4521864 MSU for Windows 8.1 64-bit (x64) - 10.5 MB
 

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