In what marks the end of an era, Microsoft has released the Windows 10 KB5066791 cumulative update, the final cumulative update for the operating system as it reaches the end of its support lifecycle.
It should be noted that users will still be able to receive extended security updates (ESUs) for up to 1 year (consumers) and 3 years (enterprise).
The Windows 10 KB5066791 update is mandatory, as it contains Microsoft's October 2025 Patch Tuesday security updates, which address six zero-day vulnerabilities and 172 other flaws.
Windows users can install this update by going into Settings, clicking on Windows Update, and manually performing a 'Check for Updates.'
However, as this update is mandatory, it will automatically start installing in Windows once you check for updates. To make this more manageable, you can schedule a time when your computer is restarted to finish the installation.
Windows 10 KB5066791 update
Source: BleepingComputer
After installing this update, Windows 10 22H2 will be updated to build 19045.6456, and Windows 10 21H2 will be updated to build 19044.6456.
Windows 10 users can also manually download and install the KB5066791 update from the Microsoft Update Catalog.
What's new in Windows 10 KB5066791
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