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WU_E_DM_DOWNLOADFILEPATHUNKNOWN
WU_E_DM_DOWNLOADFILEPATHUNKNOWN means that the update manager cannot associate downloaded content with a usable local path. It is an update-state or local-storage problem rather than an installation error.
How to investigate
- Find the earlier message for the same update ID and download job; it may explain why local state was lost.
- Check for interrupted disk, volume, or service activity during the download.
- Do not try to install a payload manually from an assumed cache location; obtain a clean, tracked download instead.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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