.NET Framework installation error 0x800f081f

The source files could not be found. Error code: 0x800f081f

Windows could not locate the files required to enable or repair a .NET Framework feature, which commonly happens during setup or server provisioning.

Observed message

The source files could not be found. Error code: 0x800f081f

Why it happens

Windows Update or WSUS does not provide the required feature payload.
The DISM source path is missing, invalid, or points to the wrong installation media.
The machine is offline or blocked from reaching the required update source.

How to fix it

Mount matching Windows installation media and pass a valid /Source path to DISM.
Temporarily allow the machine to use Windows Update if WSUS is blocking feature downloads.
Confirm the OS version and language pack match the repair source.

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