Applies ToWindows Server 2012 R2 Datacenter Windows Server 2012 R2 Standard Windows Server 2012 R2 Essentials Windows Server 2012 R2 Foundation Windows 8.1 Enterprise Windows 8.1 Pro Windows 8.1

The September 2016 update rollup includes some new improvements and fixes for the Windows 8.1 and Windows Server 2012 R2 platforms. We recommend that you apply this update rollup as part of your regular maintenance routines. Before you install this update, see the Prerequisites and the Restart requirement sections.

Improvements and fixes

To learn more about the nonsecurity improvements and fixes in this update, see the September 20, 2016 – KB3185279 section in Windows 8.1 and Windows Server 2012 R2 update history.

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.Note You must be running Microsoft Internet Explorer 6 or later versions.

Method 3: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To apply this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed on Windows 8.1 or Windows Server 2012 R2.

Restart requirement

You must restart the computer after you apply this update.

Registry information

To apply this update, you don't have to make any changes to the registry.

Update replacement information

This update doesn't replace any previously released update.

File Information

File name

SHA1 hash

SHA256 hash

Windows8.1-KB3185279-arm.msu

5CC424CFB39C3A737F4DAA9CC1A0FE4F61C445AE

AAA435A15D14C5739D646B07E603766EDB9175CA07039AF4ED964135EDE47148

Windows8.1-KB3185279-x86.msu

BD58145D747CCD9FE0921D5EC56E616EC03D9947

CB57C90A7B798452FF8DAF0C6919F0EE862A2C18526727B1967317CB26202AF2

Windows8.1-KB3185279-x64.msu

F6714F6793FB14BFAC28E84E5FFD184F1DE98F8F

C25894AE9F853B4CA8226DAB1E994DC112DBD512F105567A3232259AEA87AEF4

File informationFor a list of the files that are provided in this update, download the file information for update rollup 3185279.

References

For more information about Windows Update, go to the following Microsoft websites: Troubleshoot problems with installing updatesWindows Update: Frequently Asked QuestionsLearn about the terminology that Microsoft uses to describe software updates.

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