Microsoft released KB4530743, the cumulative update for the .NET Framework 3.5 and 4.8 for Windows 10 (version 1909/1903) and Windows Server 2019 (1909/1903), which improves the quality and reliability of the platform
KB4530743 – Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, Version 1909/1903
Microsoft released the cumulative .NET Framework update KB4530743 for Windows 10 version 1909 (November 2019 Update) and version 1903 (May 2019 Update) based on x64 processors (amd64), ARM64 and Windows Server 2019 (1909/1903) for x64-based systems .
Update KB4530743 is available for manual installation from the Microsoft Update Catalog:
Download x86 version
Download Windows Server 2019 version