KB4534309 Security Only Quality Update for Windows 8.1 - Jan. 14

January 14, 2020 - KB4534309 (Security-only update)

Applies to: Windows 8.1, Windows Server 2012 R2, Windows Embedded 8.1 Industry Enterprise, Windows Embedded 8.1 Industry Pro

Improvements and fixes

This security update includes quality improvements. Key changes include:
  • Addresses an issue to support new SameSitecookie policies by default for release 80 of Google Chrome.
  • Security updates to Windows Input and Composition, Windows Media, Windows Storage and Filesystems, and Windows Server.
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Known issues in this update


How to get this update

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU (KB4524445) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update


File information

For a list of the files that are provided in this update, download the file information for update 4534309.

Source: https://support.microsoft.com/en-us/help/4534309

Direct download links for KB4534309 MSU file from Microsoft Update Catalog:

:arrow: Download KB4534309 MSU for Windows 8.1 32-bit (x86) - 9.3 MB

:arrow: Download KB4534309 MSU for Windows 8.1 64-bit (x64) - 22.7 MB

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