August 20, 2020—KB4566116 (OS Builds 18362.1049 and 18363.1049) Preview

Applies to: Windows 10, version 1903, all editionsWindows Server version 1903Windows 10, version 1909, all editions

Highlights


  • Updates an issue that causes the hard drive to fill up in certain error situations. 
  • Updates an issue that prevents Microsoft Gaming Services from starting because of error 15612. 
  • Updates time zone information for the Yukon, Canada.
  • Updates a visual offset issue on a touchscreen. Edits you make with a pen or finger appear in a different region than expected if the device is connected to an external monitor.
  • Updates an issue that causes the Settings page to close unexpectedly, which prevents default applications from being set up properly. 
  • Updates an issue that prevents you from unlocking a device if you typed a space before the username when you first signed in to the device. 
  • Updates an issue that causes applications to take a long time to open. 

Improvements and fixes


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

    Known issues in this update


    Symptom Workaround
    When updating to Windows 10, version 1903 or Windows 10, version 1909 from any previous version of Windows 10, you might receive a compatibility report dialog with "What needs your attention" at the top and the error, "Continuing with the installation of Windows will remove some optional features. You may need to add them back in Settings after the installation completes." You might receive this compatibility warning when LOCAL SYSTEM accounts are blocked in a firewall from accessing the internet via HTTP. This is caused by the Windows 10 Setup Dynamic Update (DU) being unable to download required packages.

    If your device has access to HTTP blocked for LOCAL SYSTEM accounts, to mitigate this issue you can enable HTTP access for the Windows 10 Setup Dynamic Update (DU) using the LOCAL SYSTEM account. After you have allowed access, you can restart installation of the update and you should not see the warning. You can also continue by clicking the OK button or use the /compat IgnoreWarning command to ignore compatibility warnings but this might also ignore other warnings that your device might be affected by.

    We are working on a resolution and will provide an update in an upcoming release.

    How to get this update


    Before installing this update

    Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

    If you are using Windows Update, the latest SSU (KB4569073) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

    Install this update

    Release Channel Available Next Step
    Windows Update or Microsoft Update Yes Go to Settings > Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.
    Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
    Windows Server Update Services (WSUS) No

    You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

     

    File information

    For a list of the files that are provided in this update, download the file information for cumulative update 4566116

    Note Some files erroneously have “Not applicable” in the “File version” column of the CSV file. This might lead to false positives or false negatives when using some third-party scan detection tools to validate the build.