How do I fix Windows update standalone installer error 0x800f0838?

To fix error 0x800f0838 in Windows Update Standalone Installer:
  1. Run Windows Update Troubleshooter from Settings > System > Troubleshoot.
  2. Install missing prerequisites for the update (check the KB article).
  3. Reset Windows Update components via Command Prompt.
  4. Use DISM: Run DISM /Online /Cleanup-Image /RestoreHealth in admin Command Prompt.
  5. Try updating manually from the Microsoft Update Catalog.
 
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