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WU_E_INVALIDINDEX
WU_E_INVALIDINDEX is an API-level collection error. A caller tried to access an update, category, or history entry using an index outside the valid range.
How to prevent it
- Check collection counts before indexing.
- Remember that a new search or refresh can change collection contents; do not reuse an index from an earlier result.
- For history queries, validate the requested start index and count before processing returned entries.
Microsoft: IUpdateSearcher::QueryHistory
Microsoft: Windows Update Agent API
Microsoft: WUA success and error codes
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