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WU_E_INVALID_EVENT
WU_E_INVALID_EVENT means Windows Update could not parse XML describing an event namespace. The error points to malformed event metadata, not to a normal update payload download.
What to check
- Find the event namespace or service response named in the update log.
- For internal or managed update infrastructure, validate the XML generated by the source system.
- If a proxy or cache is involved, rule out response modification or truncation before changing the client.
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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