KB4598291 is definitely an optional update for Windows 10 v2004 & v20H2. Listed here are the direct links to download KB4598291 offline installer.

Microsoft is beginning this February 2021 with a new optional update for Windows 10 v2004 users. Becoming an optional update, Windows 10 will not install it automatically. You either need to manually trigger the update from the Settings app or upload the KB4598291 offline installer. In fact, Microsoft already released the KB4598291 update when a couple weeks back for Windows 10 v20H2 users. Now, exactly the same fixes and improvements are coming to the v2004 users.

The KB4598291 is pretty small but fixes some important things in Windows. A number of them include but not limited to freezing when doing offers on full screen, fix for incorrect daylight saving settings, problems with opening documents on the desktop, difficulties with modifier keys when using Japanese keyboard layout, etc. All in all, this is a pretty small update that if you don't require it, you don't have to install it.

To set up the update, open the Settings app, go to "Update & Security → Windows Update" and click on the "Check for updates" button. In case your product is supported, Windows will upload the KB4598291 update. To install the update with an offline machine or maybe the Windows Update causes problems, make use of the links below to download KB4598291 offline installer.

Download KB4598291 Offline installer

To make things easier for you, I discovered the direct download links for KB4598291 for both Windows 10 32-bit and 64-bit systems. Based on your system type, download the update using the below links and do the installation like every other Windows software. After installing, restart the machine and you're simply all set.

If you want KB4598291 download links for Windows Server, ARM64 based systems, or v20H2 then go to the Microsoft update catalog website to find the proper links. All you need to do is click the Download button next to the appropriate version.

KB4598291 Highlights

Updates an element that causes a device to prevent responding whenever you play a game title in full-screen or tablet mode.

Updates a problem with using Ctrl+Caps Lock and Alt+Caps Lock to change to Hiragana or Katakana mode respectively after upgrading to Windows 10, version 2004.

Updates an issue that prevents you against opening a document that's on the Windows desktop.

Updates an issue that creates duplicate cloud provider folders in the File Explorer navigation pane.

Updates a problem with some special key combinations utilized in DaYi, Yi, and Array IMEs that might cause an application to stop working.

Updates an element that displays an empty lock screen after a device wakes up from Hibernate.

Corrects historical daylight savings time (DST) information for the Palestinian Authority.

Updates an issue that incorrectly deactivates some Windows 10 Education devices after upgrading to Windows 10, version 2004.

Updates an issue that might cause the Alt+Tab to change unexpectedly and cause you to switch to the wrong window.

Updates an issue that fails to show Extract all around the shortcut menu when you right-click an online-only ZIP file.

That's it.