• download NetCat from here https://eternallybored.org/misc/netcat/
• unzip it and put is somewhere (eg: in C:)
• use directly in the command prompt like: c:\netcat-1.11\nc google.com 80
• optional: add to Environment Variables to be used from any context

Or install Nmap (includes Netcat)

• for Windows https://nmap.org/dist/nmap-7.30-setup.exe
• for Mac https://nmap.org/dist/nmap-7.30.dmg

To check whether ncat…