Net Framework 3.5 Sp1 Offline Installer ((link)) -

On modern operating systems, .NET 3.5 is technically an "Optional Feature" that is often disabled by default. Method 1: Using Windows Features (Requires Internet) Microsoft .NET Framework 3.5 Service pack 1 (Full Package)

: For older OS versions (Windows 7/8), a full redistributable package (~231 MB) is available that contains all necessary architecture files (x86 and x64). Availability by OS Version Install .NET Framework 3.5 on Windows 10 - Microsoft Learn net framework 3.5 sp1 offline installer

Method 2: Using DISM and Windows Media (For Windows 10 and 11) On modern operating systems,

This is the recommended method for modern Windows systems when you do not have a Windows installation ISO handy. It uses the NetFx3.cab file, which is the official Windows "Features on Demand" package for .NET Framework 3.5. It uses the NetFx3

The .NET Framework 3.5 Service Pack 1 is a cumulative update that contains many new features building incrementally upon .NET Framework 2.0, 3.0, and 3.5. It includes cumulative servicing updates to sub-components like the Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), and Windows Workflow Foundation (WF).