Issue: .Net 3.5 failed to install with error 0x800f0954
Date Documented: 9 Oct 2018


Symptoms / Error

  • .Net fails to install through any method with error code 0x800f0954

Cause

  • Machine is using WSUS and the .Net installer is not approved for installation for that machine.

Fix

  • Change in registry HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU\UseWUServer to a value of 0.

  • Restart Windows Update Service.

  • Install .Net 3.5 using any method desired. 

  • Reset registry value back to 1.

  • Restart Windows Update Service. 

Summary

  • Verified fix.