Windows 10 Build 19041.264 is out to Slow & Release Preview rings

Microsoft today released a new 20H1 build, 19041.264, with KB4556803. The update is out to Windows Insiders in the Slow and Release Preview rings. This Cumulative Update includes quality improvements. Here's what's new in this patch.

Windows 10 2004 20h1 May 2020 Update Banner

  • We have fixed a performance issue in Windows Mixed Reality (WMR) that prevents it from working correctly for many users.
  • We fixed an issue that prevents cleaning tools, such as Disk Cleanup, from removing previously installed updates.
  • We have updated the 2020 start date for daylight saving time (DST) in the Kingdom of Morocco. For more information, see KB4557900.
  • Security updates to Internet Explorer, the Microsoft Scripting Engine, Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Microsoft Xbox, Microsoft Edge, Windows Fundamentals, Windows Cryptography, Windows Authentication, Windows Kernel, Windows Virtualization, Windows Update Stack, Windows Core Networking, Internet Information Services, Windows Network Security and Containers, Windows Active Directory, Windows Server, and the Microsoft JET Database Engine.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.


Go to Settings > Update & Security > Windows Update and manually check for updates and choose to install the May 2020 Update.

Windows 10 version 2004, known as '20H1', is the next feature update to Windows 10, which supersedes version 1909, '19H2'. Microsoft has finished 20H1 development, so recent builds do not include a desktop watermark. It is expected to become widely available in May, 2020, and includes the following changes:

What’s new in Windows 10 Version 2004 (20H1)

Helpful links


2 thoughts on “Windows 10 Build 19041.264 is out to Slow & Release Preview rings

  1. Partha

    It fails to install !!!

  2. Shyam Reddy

    Thanks Sergey! Installing while we speak.


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