What’s New in Windows 10 KB4491101 Update

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After months of interruption, Microsoft has finally released a new cumulative update for the very first version of Windows 10, commonly known as Windows 10 Threshold 1. The new update KB4491101 provides bug fixes and other improvements as well as bug fixes that led the O.S. to build 10240.18135.

What’s new in KB4491101?

You can read the new corrections below.

Troubleshooting the download of IE images

This update fixes a problem caused by previous versions and prevents Internet Explorer from loading images. The error was discovered in images with a backslash () in the relative source path.

Reliability problem

A reliability issue in win32kfull.sys has also been fixed in KB4491101. The bug was originally discovered in KB4487026.

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Known issues in this update

  • After installing this update, the first character of the Japanese era name is not recognized as an abbreviation and can cause data analysis problems.
  • Applications that use a Microsoft Jet database in Microsoft Access 95 file format may no longer work.

To obtain this update

Before installing this update Microsoft strongly recommends that you install the latest service stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to minimize potential problems with the installation of the LCU and the application of Microsoft security patches.


Microsoft has recently started testing a new cumulative update for version 1809, but it is only available to users in the Ring Release Preview version preview. Deployment for public devices could take place next Tuesday, although it is quite clear at the moment that Microsoft wants to thoroughly test the cumulative update as part of the Insider program to ensure that everything works properly.

In addition, users are advised to open the System Restore function to create a restore point before installing updates. If there is a problem after the update, it can be restored immediately via the restore point. After installing this cumulative update, the OS version number increases to 10240.18135.


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