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.NET Framework installation failed because the source files could not be downloaded

The source files could not be downloaded.

Windows could not download the files required to enable .NET Framework 3.5, which usually points to update-source connectivity problems or blocked repair-content access.

0x800F0906installation

Observed message

The source files could not be downloaded.

Why it happens

  • The machine cannot reach Windows Update or Microsoft Update.
  • WSUS or Group Policy is preventing the system from downloading repair content directly.
  • No valid alternate feature source has been provided.

How to fix it

  1. Verify the machine can reach the required Windows Update endpoints.
  2. Review WSUS and optional component repair policy settings.
  3. Use matching installation media or another valid alternate source path for the feature files.

Official reference

.NET Framework 3.5 installation errors

Related errors

0x800F0906.NET Framework 3.5 installation could not download the required filesCan't install the .NET Framework 3.5 without a public Internet environment on an OEM Windows installation.NET Framework 3.5 installation failed on an OEM Windows image without public Internet access0x800F0922.NET Framework 3.5 installation failed with 0x800F09220x800F0907.NET Framework 3.5 installation was blocked by group policy or source configuration

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The source files could not be downloaded .NET Framework: causes and fixes | Error Atlas