Getting a "free" ISO for Windows 10 Pro for Workstations is a bit of a trick—the ISO itself is free to download from official sources, but using the software requires a paid license The Official "Workaround" for the ISO
: During installation, you will select "Windows 10 Pro for Workstations" from the list of available editions if your product key supports it. Direct ISO Download (Browser Workaround) : Windows 10 Pro For Workstations Iso Download Free