DSIM Windows 10 Creators Update (1703) Error: 0x800f081f

After being unable to install .NET 3.5 on a clean Windows 10 Pro install, this led me to do a DISM /Online /Cleanup-Image /RestoreHealth which would NOT complete.

Microsoft shipped Creators Update with missing and/or corruptĀ MUM files (Microsoft Update Manifest, error CBS Corrupt MUM).

Error screenshot:

Follow the guide here or here to resolve.

Basically involves removing the following Registry entries (you have to give yourself “Full Control” before you can delete them). Backup the keys just in case you ever want them.

  1. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\PackageIndex\Microsoft-Windows-TestRoot-and-FlightSigning-Package~31bf3856ad364e35~amd64~~
  2. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages\Microsoft-Windows-TestRoot-and-FlightSigning-Package~31bf3856ad364e35~amd64~~10.0.15063.0


Confirm in an elevated command prompt:

dism.exe /online /cleanup-image /restorehealth

I would suspect millions of Windows 10 Creators Update 64-bit machines suffer this issue and can’t properly add/remove Windows features or repair using DISM.

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