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WU_E_SETUP_INVALID_IDENTDATA
WU_E_SETUP_INVALID_IDENTDATA means the wuident.cab identification data used by the Windows Update Agent setup path was invalid. This indicates bad or mismatched setup metadata, not an ordinary update download error.
Useful checks
- Identify the update source and confirm whether other clients receive the same failure.
- Look for earlier content-validation, proxy, or metadata errors in the update log.
- Reacquire content through the trusted update path rather than trying to replace individual CAB files manually.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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