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WU_E_SETUP_SOURCE_VERSION_MISMATCH
WU_E_SETUP_SOURCE_VERSION_MISMATCH means the Windows Update Agent setup metadata declares source file versions that do not match the files actually supplied. This is a content-consistency or source-integrity problem.
What to investigate
- Check whether a proxy, cache, mirror, or local package source can return a mixed set of old and new files.
- Verify that the managed update source finished synchronization before serving clients.
- Do not attempt to combine files from different Windows Update Agent packages manually.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
Microsoft: Windows Update proxy selection
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