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The new update is now available for Windows 10 version 21H2, version 21H1, and version 20H2 As per the official release notes, Microsoft has published two main cumulative updates for Windows 10 - KB5009543 and KB5009545.

This month's cumulative updates include security fixes for November 2021 Update, May 2021 Update, October 2020 Update (version 20H2). This update is not available for May 2020 Update (version 2004) if you use the consumer edition, but the same update will be offered on devices using enterprise or education SKUs.

The update is available via Windows Update, WSUS, and the Microsoft Update Catalog with numerous bug fixes and performance enhancements.

The full list of Windows 10 updates released today are:

• Windows 10 version 1507 — KB5009585 (İS Derlemesi 10240.19177)
• Windows 10 version 1607 — KB5009546 (İS Derlemesi 14393.4886)
• Windows 10 version 1703 — EOS
• Windows 10 version 1709 — EOS
• Windows 10 version 1803 — EOS
• Windows 10 version 1809 — KB5009557 (İS Derlemesi 17763.2452)
• Windows 10 version 1903 — EOS
• Windows 10 version 1909 —  KB5009545 (İS Derlemesi 18363.2037)
• Windows 10 version 2004, 20H2 and 21H1 — KB5009543 (İS Derlemeleri 19042.1466, 19043.1466 ve 19044.1466)

Like every Patch Tuesday, you can check for and install new updates by going to Settings, clicking on Windows Update, and selecting 'Check for Updates' to install the updates.

What's new in the latest cumulative update for Windows 10

• Updates a known issue that affects Japanese Input Method Editors (IME). Text you enter might appear out of order or the text cursor might move unexpectedly in apps that use the multibyte character set (MBCS).
• Updates security for your Windows operating system. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
• This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5009543-and-kb5009545-updates-released/