“C1900101-30018 Windows Update ran into a problem” error message during Windows 10 upgrade

Updated: 19-Sep-2025 | Answer ID: 477
“This article shows how to resolve C1900101-30018 error when encountered during a Windows 10 upgrade.

If you encounter this error message during an upgrade to Windows 10, please follow the instructions below.

  1. Verify your system has met all the requirements for Windows 10.
  2. Close all programs and tasks and re-try the upgrade again.

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