The Microsoft .NET Framework 4.8 is a highly compatible, in-place update to the Microsoft .NET Framework 4, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 and 4.7.2.

July 14, 2026-KB5100998 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 and Microsoft server operating system 24H2

The May 12, 2026 update for Windows 11, version 25H2 and Microsoft server operating system 24H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines.

The May 12, 2026 update for Windows 11, version 24H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines.

The April 14, 2026 update installs the complete .NET Framework 3.5 product for Windows 11, version 26H1 (build version 28000) and newer. Unlike traditional cumulative updates that patch individual components, this delivers the full .NET Framework 3.5 product as a standalone installer. It replaces any previously installed version.

Microsoft .NET Framework 4.8.1 is a highly compatible and in-place update to .NET Framework 4.8. It includes native support for the Arm64 architecture (Windows 11+), accessibility improvements as well as other improvements.

The May 26, 2026 update for Windows 11, version 25H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines.

The July 14, 2026 update for Windows 11, version 26H1 includes security and cumulative reliability improvements in .NET Framework 4.8.1. We recommend that you apply this update as part of your regular maintenance routines.

July 14, 2026-KB5101006 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 and Windows 10 Version 22H2