If you don’t have access to an ISO, use UUP Dump (a legitimate community tool that generates download scripts for Microsoft-sourced files).
Let’s break down the name:
He grabbed his toolkit. He needed to crimp a cable, run it across the floor, bypass the internal switch to reach a port that actually had outside access without tripping the IDS (Intrusion Detection System). He felt like a surgeon performing a bypass operation. Download Microsoft-windows-netfx3-ondemand-package.cab