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WU_E_UH_APPX_INSTALLED_PACKAGE_VOLUME_UNAVAILABLE
WU_E_UH_APPX_INSTALLED_PACKAGE_VOLUME_UNAVAILABLE means the application being updated is installed on a package volume that is currently unavailable. This is common when the package lives on a disconnected secondary drive or a volume that failed to mount.
What to check
- Confirm that the drive hosting the package is online and accessible.
- Use AppX tooling to identify the package and its install location before retrying the update.
- If the volume is permanently gone, repair or reinstall the application package rather than repeatedly retrying Windows Update.
Get-AppxPackage -AllUsersMicrosoft: PackageVolume class
Microsoft: Windows Update error reference
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