Installing python packages in PLAXIS connect edition v20.04

Hi, i have a question regarding installing third party pythoon packages. Previously i could find the Python interpreter and the scripts folder, and from there install the packages using pip. I can't find this folder anymore. According to the manual, i should do the following:

When you want to install a third party package that isn‘t already available in the Python installation then you can
do so by opening the command prompt from Expert > Python > Command prompt

If i do so, a command window opens (on the directory: Desktop). When entering a command line pip install "somepackage" it gives: pip is not recognized.

My question: How to install the third party package?