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| WU_E_SYSTEM_UNSUPPORTED | WU_E_INVALID_SERIALIZATION_VERSION |
WU_E_NO_SUCH_HANDLER_PLUGIN
WU_E_NO_SUCH_HANDLER_PLUGIN means the current Windows Update Agent does not provide the download, installation, or applicability-evaluation plugin named by the update. This is a local component mismatch, not a proxy error.
What to verify
- Confirm that the update is supported by the installed Windows release and servicing level.
- Review the Windows Update log for the handler or evaluator name that could not be loaded.
- For managed content, verify that the update metadata is intended for this client platform and is not being offered to an unsupported image.
Microsoft: WUA success and error codes
Microsoft: Windows Update Agent API
Microsoft: Windows Update log files
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