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WU_E_UH_FALLBACKTOSELFCONTAINED
WU_E_UH_FALLBACKTOSELFCONTAINED is a recovery instruction rather than a final installation error: the handler needs a full self-contained payload instead of the delta-compressed variant.
What to do
- Allow Windows Update to request the alternate content and begin a new download.
- For WSUS, verify that the full content is synchronized and available to the client.
- Investigate repeated fallback when a client never reaches a successful download; the original delta-content path may be incomplete or inconsistent.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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