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WU_E_UH_FALLBACKERROR
WU_E_UH_FALLBACKERROR means the preferred install path failed and the handler also failed when trying to fall back to self-contained content. This often points to a package integrity problem, missing alternate content, or broken metadata relationships.
Useful checks
- Check whether the update payload was fully downloaded and whether a second download was requested earlier in the logs.
- Look for content hash, metadata, or applicability errors that occurred before the fallback attempt.
- Do not manually substitute files; obtain fresh content from the intended update source.
Microsoft: Windows Update log files
Microsoft: Fix Windows Update corruptions and installation failures
Microsoft: Windows Update error reference
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