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WU_E_DM_NOTDOWNLOADED
WU_E_DM_NOTDOWNLOADED means that Windows Update reached a point where local payload content was required, but it was not available. The decisive cause may be earlier in the scan or download sequence.
How to investigate
- Find the earlier error for the same update ID rather than treating this code as the root cause.
- Check whether a download was deferred by network-cost policy, service availability, or user/session conditions.
- Start a new update scan and download after the original cause has been resolved.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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