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WU_E_OL_UNEXPECTED
WU_E_OL_UNEXPECTED is the generic error for an offline-scan failure not covered by a specific WU_E_OL_* result. The root cause may be catalog integrity, client compatibility, or the way the offline scan service was created.
How to investigate
- Record the scan file version, its source, the WUA version, and the exact API workflow used.
- Search the update log for a more specific error before this one.
- Test the same official scan package on an otherwise comparable, fully serviced device to separate catalog and client problems.
Microsoft: Using WUA to scan for updates offline
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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