KB4586876 for .NET Framework 4.8 , 3.5 for Windows 10 2004 and 20H2

Latest LCU KB4586876 for .NET Framework 4.8, 3.5 for Windows 10 2004 and 20H2 changelog and direct download link.


Just now we have covered KB4592784 that refers to Windows Feature Experience Pack 120.2212.1070.0. On the same date aka 30 Nov 30, 2020, a Cumulative Update Preview for .NET Framework 4.8 and 3.5 for Windows 10 2004 and 20H2 is rolling out.

This is KB4586876 to update as a part of regular maintenance routines.

KB4586876 for .NET Framework 4.8 , 3.5 for Windows 10 2004 and 20H2

Here is the changelog –


Addresses an issue in which a FailFast crash occurs in apps that have two threads that both load application resources.


Improves the clean-up process for X509Certificate2 certificates.

How to download the LCU and install

Through auto Windows update

  1. Click the – Start.
  2. Type – updates.
  3. Select – Check for updates.
  4. After a while, the system will download the LCU; click – Install now.

Via Microsoft update catalog

  1. Go to the KB4586876 direct download link – http://www.catalog.update.microsoft.com/Search.aspx?q=4586876.
  2. Locate the correct file such as having x.64, x86, or ARM for your system.
  3. Click the – Download.
  4. Right-click on the download .msu file and select Open.
  5. Follow the guide on the screen and complete the installation of the patch.

1] KB4576478 .NET Framework 4.8 and 3.5 Update Windows 10 2004
2] KB4562899 .NET Framework 4.8, 3.5 update Windows 10 2004
3] KB4569745 .NET Framework 4.8, 3.5 update for Windows 10 2004 August 2020
4] KB4555452 .NET Framework 4.8 and 3.5 Windows 10 2004

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Topics:  Windows update
About Sunita
Love to play with Windows 11 and 10. Suggestion - Going for Registry change or system files edit then remember to take a backup or create a restore point before Starting.