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WU_E_INVALID_SERIALIZATION_VERSION
WU_E_INVALID_SERIALIZATION_VERSION means a component requested an update-data serialization format that this Windows Update client does not support. It is usually a client/API compatibility problem.
What to verify
- Check the WUA version and the application or management component that invoked it.
- Avoid altering serialized data manually; update the client, management tool, or API integration to matching supported versions.
- If the failure began after an update-service change, compare a working and failing client for WUA and operating-system differences.
Microsoft: Using the Windows Update Agent API
Microsoft: Windows Update error reference
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