August 10, 2021-KB5004331 Cumulative Update for .NET Framework 3.5 …
https://support.microsoft.com/en-us/topic/august-10-2021-kb5004331-cumulative-update-for-net-framework-3-5-and-4-8-for-windows-10-version-2004-windows-server-version-2004-windows-10-version-20h2-and-windows-server-version-20h2-and-windows-version-21h1-3b963e81-640a-4147-8574-c04f55cd1d08
WEBRelease Date: August 10, 2021. Version: .NET Framework 3.5 and 4.8. The August 10, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2, and Windows Version 21H1 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8.
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