September 26, 2019
.NET Framework 3.5 and 4.8
The September 26, 2019, update for Windows 10, version 1903 and Windows 10, version 1909 includes cumulative reliability improvements in Micorosoft .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
1 Base Class Library (BCL)
2 Windows Presentation Foundation (WPF)
3 Common Language Runtime (CLR)
How to obtain and install the update
Install this update
This update will be downloaded and installed automatically from Windows Update.
To get the standalone package for this update, go to the Microsoft Update Catalog website.
For a list of the files that are provided in this update, download the file information for cumulative update.
To apply this update, you must have .NET Framework 3.5 or 4.8 installed.
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.
Update replacement information
This update replaces previously released update 4511555 for Windows 10, version 1903.