While installing .NET Framework 3.5, encountered error code 0x800f0954. How to fix?

Question

CCR application needs .NET Framework 3.5 to run. Error code 0x800f0954 is reported by installer and powershell. Tried stop/restarting WUserver, changed the value in regedit, restarted computer.

Answer 1

https://www.ajtek.ca/wsus/how-to-install-net-3-5-rsat-tools-and-other-optional-components-with-wsus/

Run through this and you should be able to install it.

Answer 2

Dear Napolean McCormick,

The error code 0x800f0954 typically occurs when the system is configured to use a WSUS server that does not support optional feature installations. Since you've already modified the registry and restarted the Windows Update service, we recommend temporarily bypassing WSUS by setting the UseWUServer registry key to 0 under HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU, then restarting the system. After that, try installing .NET Framework 3.5 again using PowerShell or the “Turn Windows features on or off” dialog.

If the issue persists, manually installing the feature using DISM with a local installation source may be necessary.

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Best regards,

Harry Phan