Last updated: 2025 — Information applies to Windows 7, Windows Server 2008 R2, and related embedded versions.
Windows 7 (Windows 6.1) introduced the .NET Framework 3.5.1 as an integral operating system component. Unlike later versions of Windows where .NET is installed as a separate layer, version 3.5.1 in Windows 7 was deeply integrated.
The file is a system update package for Windows 7 (64-bit). It is specifically associated with .NET Framework 3.5.1 or .NET Framework 4.0 setup components.
Notice the pattern: Windows[Version]-KB[Number]-[Architecture].msu
Are you getting a when you try to run the installer? KB4489885 - Microsoft Update Catalog
