The drive fell silent. They all remembered the Great Dependency Crash of 2018.
That is the web bootstrapper, not the full offline installer. It will download additional files during installation. For a true offline microsoft net framework 3.5 1 windows 7 64 bit download , you need the full ~230 MB package or the sxs folder from Windows 7 DVD. microsoft net framework 3.5 1 windows 7 64 bit download
Click the checkbox next to it so it is fully selected (a checkmark, not a solid square). Click . The drive fell silent
For silent installation or deployment across multiple machines, use DISM (Deployment Imaging and Servicing Management). microsoft net framework 3.5 1 windows 7 64 bit download