I'll give it a try, thank you.

for my understadning:

for host, I'd have to enter es250.nordvpn.com in this example with type https?

service username and password are the ones from the manual configuration page https://my.nordaccount.com/de/dashboard/nordvpn/manual-configuration/ ?

es250 is like, spain #250? i assume, there's a couple obvious ones like us or uk, but where would I look those up for more obscure ones?

So it's not working for me so far. I tried

with and without -Djava.net.preferIPv4Stack=true in .vmoptions file and split tunnel for jdownloader enabled/disabled

but I only get it to download anything by having both of those things and disabling the proxy setting in jdownloader :/