According to the announcement, the update KB4598291 bumps the version number to build 19042.789 and 19041.789 for version 20H2 and 2004, respectively, and addresses many issues. For example:

Resolves problems causing a device to stop responding when you play a game in full-screen or tablet mode. Fixes an issue that prevents opening a document that is on the Windows desktop. Corrects historical daylight savings time (DST) information for the Palestinian Authority. Address a problem that fails to show Extract all on the shortcut menu when right-clicking an online-only ZIP file. Corrects an issue that creates duplicate cloud provider folders in the File Explorer navigation pane. Fixes a problem that shows a blank lock screen after a device wakes up from Hibernate. Address an issue using Ctrl + Caps Lock and Alt + Caps Lock to switch to Hiragana or Katakana mode. Fixes a problem that incorrectly deactivates some Windows 10 Education devices after upgrading to Windows 10 version 2004. Addresses an issue that might cause the Alt + Tab order to change unexpectedly and cause to switch to the wrong window. Correct a problem with some key combinations used in DaYi, Yi, and Array IMEs that might cause an application to stop working.

Microsoft is listing the complete set of improvements and fixes for Windows 10 build 19042.789 at the Windows Blog. In addition, the update is also available in the Beta and Release Preview Channels of the Windows Insider Program with these changes:

Addresses a problem with Microsoft Exchange accounts and some Surface Hub devices after updating to Windows 10 20H2. The message “Something went wrong” appears, and the error code is 0x80131500. Fixes an issue with Windows Update scans when an authenticated proxy is used as a fallback for the sync service after the previous proxy setting fails. Addresses a problem that causes an update from Windows 10 version 1703 to 20H2 to fail on a Surface Hub device. The message “Getting ready…” remains on the screen indefinitely.

Download Windows 10 build 19042.789

The preview is available immediately, and you can download it from Settings > Update & security > Windows Update and clicking the Check for updates button. Then under the “Optional quality update available” section, click the Download and install option. All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.