Fix 2026-08 Preview Update KB5120998 (OS Builds 26200.9278 and 26100.9278) Not Installing Windows 11 @AaronTechSol

Uploaded August 2026 | Updated September 2026, 3 weeks ago

How To Fix 2026-08 Preview Update KB5120998 (OS Builds 26200.9278 and 26100.9278) Fail To Install, Fix Download/Install Error Code when Installing 2026-08 Preview Update KB5120998 (OS Builds 26200.9278 and 26100.9278) On Windows 11, Fix Can't Update Windows 11 2026-08 Preview Update KB5120998 (OS Builds 26200.9278 and 26100.9278)
Step 1) Run SFC & DISM Command
sfc /scannow
Dism /Online /Cleanup-Image /RestoreHealth
DISM /Online /Cleanup-Image /StartComponentCleanup
If scans are stuck, follow the next step
Step 4) Use Microsoft Update Catalog
catalog.update.microsoft.com/Home.aspx
Step 6) Use Media Creation Tool
microsoft.com/en-us/software-download/windows11

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