KB4601554 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10 Win Update

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    KB4601554 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10

    KB4601554 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10

    For Windows 10 version 2004, 20H2, and 20H1 - May 11
    Category: Win Update
    Last Updated: 3 Weeks Ago at 11:13
    UPDATE 5/25: KB5003254 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10


    May 11, 2021 - KB4601554 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1

    Release Date:
    May 11, 2021

    Version:
    .NET Framework 3.5 and 4.8

    The May 11, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequsites and Restart requirement sections.

    Quality and reliability improvements

    CLR1 - Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter.
    - Addresses an issue with slowdowns that could occur when making large numbers of devirtualized calls into MarshalByRefObject-derived code.
    WPF2 - Addresses an issue with lag responding to typing in TextBox, when spell-checking is enabled that was introduced in an update earlier this year.
    - Addresses an issue with a leak of touch-related resources, including OS handles, when closing a window. The leak only occurs when a touch device is active, and only for windows whose HwndSource is created directly by the app.
    - Addresses a crash when docking a window within Visual Studio, or, more generally, disposing an HwndSource whose RootVisual is null.
    Winforms - Addresses an issue in ComboBox drop down item bounding rectangle as exposed to the accessibility tools, where we did not take into account that some items might be scrolled out of view, we had always started counting items from the first visible one, and thus item rectangle location was incorrect.
    - Implemented ScrollItemPattern (IScrollItemProvider (uiautomationcore.h) - Win32 apps | Microsoft Docs) for ComboBox drop down items.
    1 Common Language Runtime (CLR)
    2 Windows Presentation Foundation (WPF)

    How to get this update

    Install this update

    Release Channel Available Next Step
    Windows Update and Microsoft Update Yes To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.
    Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
    Windows Server Update Services (WSUS) Yes This update will automatically sync with WSUS if you configure Products and Classifications as follows:
    Product: Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1
    Classification: Updates

    File information

    For a list of the files that are provided in this update, download the file information for cumulative update.

    Prerequisites

    To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

    Restart requirement

    You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

    How to obtain help and support for this update


    Known issues in this update

    Microsoft is not currently aware of any issues in this update.


    Source: https://support.microsoft.com/en-us/...3-226f7798225a

    See also: https://devblogs.microsoft.com/dotne...ollup-updates/


    Direct download links for KB4601554 MSU file from Microsoft Update Catalog:

    Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 32-bit (x86) - 41.6 MB

    Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 64-bit (x64) - 65.2 MB

    Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 ARM64 - 41.6 MB
    Brink's Avatar Posted By:

  1. Ghot's Avatar
    Posts : 10,831
    Win 10 Home 10.0.19043.1055 (x64) [21H1]
       #1

    Already have this from February 2021.
    I tried to install, it said... 'already installed'. Must be a re-release. Microsoft just making sure.
    Last edited by Ghot; 12 May 2021 at 20:17.
      My Computer

  2. Melchior's Avatar
    Posts : 321
    Windows 10 Pro (x64)(v21H1)(Build 19043.1055)
       #2

    yup... downloaded from here and it said already installed too...
    it was under.. other updates so it must have been a preview update... yup it was...
      My Computers


  3. Posts : 289
    Win 10 PRO 64 Bit
       #3

    Same here already installed last Feb.
      My Computer

  4. steve108's Avatar
    Posts : 12,616
    19041.1052 - 2004/20H1 Home x64
       #4

    Mine got installed 5/11 oddly enuf Actually, maybe because I didn't fall for the preview update.
      My Computer

  5. IronZorg89's Avatar
    Posts : 2,425
    Windows 10 pro x64-bit
       #5

    Windows Update Standalone Installer from MUC said that KB4601554 is already installed, but I cannot see it anywhere be it from Update History or from Uninstall Updates in Control Panel. When I say that MS gets me really confused at times, most of the times, it is not to be taken lightly. What gives!
      My Computers

  6. steve108's Avatar
    Posts : 12,616
    19041.1052 - 2004/20H1 Home x64
       #6

    IronZorg89 said:
    Windows Update Standalone Installer from MUC said that KB4601554 is already installed, but I cannot see it anywhere be it from Update History or from Uninstall Updates in Control Panel. When I say that MS gets me really confused at times, most of the times, it is not to be taken lightly. What gives!
    Did you check the "Other Updates" section, which is where mine is?
      My Computer

  7. IronZorg89's Avatar
    Posts : 2,425
    Windows 10 pro x64-bit
       #7

    steve108 said:
    Did you check the "Other Updates" section, which is where mine is?
    I checked everywhere (all three sections in Update history—Of course, I didn't expect to see it in "Definition Updates") and lastly in Uninstall Updates from Control Panel.
      My Computers


  8. Posts : 289
    Win 10 PRO 64 Bit
       #8

    Mine is in the other Updates also
      My Computer

  9. IronZorg89's Avatar
    Posts : 2,425
    Windows 10 pro x64-bit
       #9

    smalltown said:
    Mine is in the other Updates also
    I have not seen it there either.
      My Computers


 
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