Update enables downgrade rights between Windows 10 IoT and Windows Embedded 8.1 Industry

This article describes an update that enables downgrade rights between Windows 10 Internet of Things (IoT) and Windows Embedded 8.1 Industry. Before you install this update, see the Prerequisites section.

About this update

The operating system is not activated when it downgrades from Windows 10 IoT to Windows Embedded 8.1 Industry. This update provides the required Product Keys that bridges Windows 10 IoT Enterprise and Windows Embedded 8.1 Industry. The change is made to the Windows Embedded 8.1 license file to accept the Product Keys that has been issued to the Windows 10 IoT Enterprise edition.

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 a Recommended update on Windows Update. For more information on 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 6.0 or later.

Update detail information


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 in Windows 8.1.

Registry information

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

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

Microsoft has traditionally provided downgrade rights to original equipment manufacturers (OEMs) for certain versions of Windows. This is when the OEM purchases a set of Product Keys for version x but installs version x-1 for some time after version x launches. The product key works for both versions. 

For more information about downgrade rights, see Microsoft Volume Licensing Brief: Downgrade Rights.


Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.
Windows Embedded 8.1 Industry
Additional file information

Article ID: 3144850 - Last Review: May 10, 2016 - Revision: 1