Network Connection with proxy server script?

I’m behind a corporate firewall and for years I have not been able to make outside connections with Knime (load extensions etc.). Now, I just started the L2 course, and for the exercises its necessary drag and drop the respective workflows into the local workspace, which unsurprisingly doesn’t work (I didn’t find a way of just downloading these, though, d&d is the only option???), and which prompted me to look into this further.

So, I found that under Preferences > General > Network Connections I can define the proxy server that’s being used. Looking up the system proxy settings, however, they don’t point to a server address, but use a script instead: http://127.0.0.1:9000/localproxy-***.pac. I tried editing the proxy entries putting in the scrip address, but that didn’t fly. Is there any way to make that work (without involving IT, which is usually very unhelpful)?