The August 27, 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.

Download the Microsoft .NET Framework 4.8 offline installer package now. For Windows RT 8.1: Download the Microsoft .NET Framework 4.8 package now. For more information about how to download Microsoft support files, see How to obtain Microsoft support files from online services . Virus Scan Claim: Microsoft scanned this file for viruses.

August 11, 2026-KB5120701 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 and Windows 10 Version 22H2

The September 8, 2026 update for Windows 10 Version 21H2 and Windows 10 Version 22H2 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. Before you install this update, see the Prerequisites and Restart requirement sections.

The September 8, 2026 update for Windows 11, version 23H2 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. Before you install this update, see the Prerequisites and Restart requirement sections. Summary Security ...

August 11, 2026-KB5120703 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1809 and Windows Server 2019

August 11, 2026-KB5120710 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2

5126048 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1809 and Windows Server 2019 (KB5126048) How to get this update

The September 8, 2026 update for Windows 10, version 1809 and Windows Server 2019 includes security and 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 ...

The Microsoft .NET Framework 4.8.1 Language Packs (KB5027937) will also be available on Windows Update and Microsoft Update Catalog for customers using non-English localized versions of Windows or those that have one or more Multilingual User Interface (MUI) pack installed. If you do not install a language pack, the text is displayed in English.