.NET Framework 3.5 installation was blocked by group policy or source configuration

Error code 0x800F0907

Windows could not install .NET Framework 3.5 because group policy or repair-source configuration prevented access to the files needed for installation.

0x800F0907installation

Observed message

Error code 0x800F0907

Why it happens

A group policy setting blocks the use of Windows Update for optional component repair.
The configured repair source is missing or inaccessible.
Windows cannot decide between policy-controlled sources and the requested install path.

How to fix it

Review the group policy settings that control optional component installation and repair.
Allow Windows to contact the appropriate update source or configure a valid local source.
Retry the install after aligning policy and source configuration.

Official reference

.NET Framework 3.5 installation errors

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