How can I fix the 2025-10 Cumulative Update for Windows 11, version 25H2 for x64-based Systems (KB5066835) (26200.6899) update from failing to update

Hello Anderson,

If the Windows 11 cumulative update (KB5066835) is failing to install, please follow these steps in order.

Before you start: Ensure you have at least 10GB of free disk space and close all unnecessary programs.

Step 1: Run the Windows Update Troubleshooter

1. Navigate to Settings > System > Troubleshoot > Other troubleshooters
2. Click Run next to Windows Update
3. Follow all prompts and restart your computer when prompted
4. Try the update again. If it still fails, proceed to Step 2.

Step 2: Clear the Windows Update Cache

1. Press Windows key + X and select Command Prompt (Admin) or PowerShell (Admin)
2. Copy and paste these commands one at a time, pressing Enter after each:

      net stop wuauserv
      net stop bits
      ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
      net start wuauserv
      net start bits
   

3. Important: Wait for each command to complete before entering the next one
4. Close Command Prompt and try the update again through Settings > Windows Update

Step 3: Repair System Files (DISM and SFC)

1. Open Command Prompt as Administrator again
2. Run the DISM command first (this can take 20-45 minutes):

      dism /online /cleanup-image /restorehealth
   

3. Once DISM completes successfully, run SFC (this takes 10-30 minutes):

      sfc /scannow
   

4. Restart your computer after both scans complete
5. Attempt the update again

Note: If either command reports errors it cannot fix, you may need professional assistance.

Step 4: Manual Installation

If Windows Update still refuses to cooperate, bypass it entirely.

1. Visit the Microsoft Update Catalog
2. Search for KB5066835
3. Download the x64 version (unless you're on a very old 32-bit system)
4. Double-click the downloaded .msu file and follow the installation wizard
5. Restart when prompted

Notes:

• If you receive specific error codes, note them down for further troubleshooting
• Ensure Windows Defender or other antivirus isn't blocking the update
• Some updates require multiple restarts to complete fully

If these steps don't resolve the issue, the problem may require advanced troubleshooting or professional support.

I hope this helps.

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