Windows 10 · 21H2 · Release · Security update (Patch Tuesday)
Feature update to Windows 10, version 21H2 (19044.6456)
- Release
- Feature update
- KB5066791 — Microsoft's article, opens in a new tab
- amd64
- arm64
- x86
Windows 10 21H2: Servicing ended
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Known issues — reported on the forum
In the news
- Issue Windows 10 ESU Banner Bug After KB5066791: Key IT Facts
- Fix Windows 10 End of Support: Final KB5066791 Patch and ESU Guide
- Coverage Windows 10 KB5066791: Last Free Cumulative Update and ESU Path to 2026
- Fix Windows 10 End of Life: Final KB5066791 Patch and ESU Upgrade Paths
- Fix Windows 10 End of Support: Final KB5066791 Patch and ESU Migration Guide
- Fix Windows 10 End of Support 2025: Final KB5066791 Patch and Migration Guide
- Coverage Final Windows 10 Update KB5066791 Ends Mainstream Support (Oct 14 2025)
- Fix Windows 10 KB5066791: The Last Patch Tuesday Update (Oct 2025)
Discussed on the forum
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