• Windows 11 KB5012643 preview may crash .Net 3.5 Framework

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    After installing this update, some .NET Framework 3.5 apps might have issues or might fail to open. Affected apps are using certain optional components in .NET Framework 3.5, such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) components..

    To mitigate this issue, you can uninstall this update. To do this, select the Start button and type, Windows Update Settings, and select it. On the Windows Update settings window, select View Update History then select Uninstall Update. Find KB5012643 in the list and select it, then select Uninstall.

    If you cannot uninstall this update (KB5012643), you can also mitigate this issue by re-enabling .NET Framework 3.5 and the Windows Communication Foundation in Windows Features. For instructions, please see Enable the .NET Framework 3.5 in Control Panel. Advanced users or IT admins can do this programmatically using an elevated Command Prompt (run as administrator) and running the following commands:

    dism /online /enable-feature /featurename:netfx3 /all
    dism /online /enable-feature /featurename:WCF-HTTP-Activation
    dism /online /enable-feature /featurename:WCF-NonHTTP-Activation
    We are working on a resolution and will provide an update in an upcoming release.

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    • #2444756

      I never install .net previews.

      - ThinkPad T570-20HA, i7-7600U, 2.8GHz, UEFI/GPT, 16GB, Sammy 256GB M.2 NVMe PM961. HP laserjets (M254dw, P1606dn), Epson 2480 scanner -

    • #2444796

      I never install .net previews.

      This is not .net preview. This is the preview for May patch Tuesday.

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    Reply To: Windows 11 KB5012643 preview may crash .Net 3.5 Framework

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