Windows Update KB5005539 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10 - Sept. 30

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September 30, 2021 - KB5005539 Cumulative Update Preview 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 Version 21H1

The September 30, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Version 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 Prerequisites and Restart requirement sections.

Quality and reliability improvements

CLR[SUB]1[/SUB]- The existing memory pressure algorithm used in the GC.AddMemoryPressure API is triggering induced GC too aggressively. This update provides an alternative algorithm that is less aggressive. An application can opt into the new algorithm, by setting:
COMPlus_GCNewMemoryPressure environment variable to 1
This is applicable for any application that use the GC.AddMemoryPressure API.
[SUB]1[/SUB] Common Language Runtime (CLR)

How to get this update

Install this update

Release ChannelAvailableNext Step
Windows Update and Microsoft UpdateYesTo download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.
Microsoft Update CatalogYesTo get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)NoYou can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

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: September 30, 2021-KB5005539 Cumulative Update Preview 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 Version 21H1


Direct download links for KB5005539 MSU file from Microsoft Update Catalog:

Download KB5005539 MSU for Windows 10 v2004, v20H2, and v21H1 32-bit (x86) - 41.8 MB

Download KB5005539 MSU for Windows 10 v2004, v20H2, and v21H1 64-bit (x64) - 65.4 MB

Download KB5005539 MSU for Windows 10 v2004, v20H2, and v21H1 ARM64 - 41.8 MB
 

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