.net 3.5 Offline Installer Windows 11 Updated May 2026

Open Command Prompt as Administrator (right-click Start button > Terminal (Admin) > choose Command Prompt).

If you are a developer, a gamer running classic titles, or an enterprise user maintaining legacy software, you have likely encountered the dreaded prompt: “This application requires .NET Framework 3.5.” .net 3.5 offline installer windows 11

While Windows 11 comes with .NET Framework 4.8 (and newer) pre-installed, version 3.5 (which includes 2.0 and 3.0) is not enabled by default. The most common method to install it is via Windows Features during an active internet connection, but what if your PC is offline, on a restricted network, or the online download keeps failing? Copy the ISO to your offline Windows 11 PC (via USB)

Copy the ISO to your offline Windows 11 PC (via USB). Double-click the ISO file to mount it as a virtual DVD drive. Note the drive letter (e.g., D: ). Inside the mounted drive, navigate to the sources\sxs folder

Inside the mounted drive, navigate to the sources\sxs folder. You should see a file named microsoft-windows-netfx3-ondemand-package.cab . This is the offline source.

Published: April 13, 2026 | Reading Time: 4 minutes