Looks like you haven’t got the ttn python library installed…
If you installed python from the python site using the windows installer hopefully you have python3.x installed? If you do on your cmd prompt type: “pip install ttn” without the quotes.
^ disregard that I just read through the error msg.
I’ll see what my ttn read application script says, I don’t use the ttn node-red or python libraries, found it easier to use the std paho-mqtt for python and std mqtt node-red libraries.