Download Microsoft-windows-netfx3-ondemand-package.cab !!better!!

If you don’t have access to an ISO, use UUP Dump (a legitimate community tool that generates download scripts for Microsoft-sourced files).

Usually not. But if you must: dism /online /remove-package /packagepath:... Download Microsoft-windows-netfx3-ondemand-package.cab

to a convenient location, e.g., C:\temp\ If you don’t have access to an ISO,

Some prefer to specify the source folder instead of the exact file: Download Microsoft-windows-netfx3-ondemand-package.cab