Cannot install NetFx3 feature without sources after installation of KB4458469

Question

Using Enable-WindowsOptionalFeature, I can no longer install NetFx3 (.NET Framework 3.5) after installation of KB4458469 (cumulative update 2018-09). Here are the steps I have performed:

1. Before the installation of KB4458469 I am able to install NetFx3. The following command succeeds:

Enable-WindowsOptionalFeature -FeatureName NetFx3 -Online 2. I uninstall it immediately afterwards, and reboot my pc as requested:

Disable-WindowsOptionalFeature -FeatureName NetFx3 -Online 3. I run Windows Update, which installs KB4458469 and 2 Windows Defender updates (KB2267602 and KB4052623). 4. Now I can no longer install NetFx3. The following command fails:

Enable-WindowsOptionalFeature -FeatureName NetFx3 -Online

Here is the output:

Enable-WindowsOptionalFeature : Enable-WindowsOptionalFeature failed. Error code = 0x800f0950

At line:1 char:1

• enable-WindowsOptionalFeature -FeatureName NetFx3 -Online

    + CategoryInfo          : NotSpecified: (:) [Enable-WindowsOptionalFeature], COMException

    + FullyQualifiedErrorId : Microsoft.Dism.Commands.EnableWindowsOptionalFeatureCommand

I know this can be solved by supplying the Windows installation sources, but I don't want to have to have these around when I need to install NetFx3.

Is there something I can do before or after the update so I can install NetFx3 (without sources) after the installation of KB4458469?

Answer 1

ok carry, while enabling any feature, first disable secure boot

Answer 2

Thank you for your reply, but the issue has been resolved. I could still test your solution using a backup from before the issue was resolved, but this will take more time than I am willing to spend on this.

Answer 3

sfc /scannow

Dism.exe /online /Cleanup-Image /StartComponentCleanup

Dism.exe /Online /Cleanup-Image /RestoreHealth

Answer 4

The issue has been resolved with the installation of the October update.