KB4566866: Windows 10 2004 Build 19041.330 and 20H2 Build 19042.330

Microsoft releases a new non-security patch for Windows 10 2004 i.e. KB4566866. This cumulative update increases the build version of Windows 10 20H1 to 19041.330 whereas 20H2 to Build 19042.330.

Windows 10 users won’t be able to get this update via the Update section or through WSUS. All you need is to visit the update catalog, download and install the standalone package. However, for now, this option stays disabled as well. Hence, we recommend downloading the respective-CAB file and install this through DISM.


KB4566866 Changelog 

Here are the key changes that appear on this build release –

  • Addresses the “Print spooler stopped unexpectedly” issue that arrives after installing the KB4557957 patch.

Known Issues

Issue – After installing this release, the device with the “WWAN LTE modem” won’t connect to the internet. However, users will still receive a working signal at the notification area. 

Sol – Microsoft is working on a resolution and may upload the same in an upcoming security-patch. 

How to download KB4566866

As of now, Microsoft hasn’t provided any link to download the KB4566866 cumulative update. However, you may click over the direct links below to download and install the respective update as per your system architecture –

Note: Once you download the particular file matching your system bit configuration, install them through DISM Window 10.

Release Note – Not available yet.


  1. This crashed my pc and stopped windows working until I uninstalled the update! Thanks Microsoft!

  2. It actually broke our print spooler on 15+ machines that did not have the initial KB installed.

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