Hi
Trying to install and operate the Sniffer based on nRF52840 USB Dongle
Having the nRF Connect for Desktop installed and burned the Dongle in accordance with the instructions using the Programmer in nRF Connect
Now trying to follow the instruction to install the Sniffer software as described here:
The problem I encountered on the page: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_sniffer_ble%2FUG%2Fsniffer_ble%2Finstalling_sniffer_plugin.html
is at step 1b - typing the command pip3 install -r requirements.txt as required does not produce the required result and generates an error:

which is "pip3 is not recognized as an internal or external command...."
Of course, I'm in the correct folder of Sniffer /extcap as required at step 1a..
Of course, without completion of the 1b the rest of the procedure does not work
Please advise
Thank you
Alex