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WU_E_DM_DOWNLOAD_VOLUME_CONFLICT
WU_E_DM_DOWNLOAD_VOLUME_CONFLICT means that Windows Update has conflicting storage-volume requests for one download. It is a coordination problem, not an indication that the update file itself is invalid.
What to check
- Identify concurrent update, management, or installation activity targeting the same device.
- Confirm the intended system and package storage volumes are online and consistent with policy.
- Allow the conflicting operation to finish or cancel it through its owner, then start one clean download request.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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