I know how you feel. I hope you succeed both with your server and throwing out windows.
Godspeed on your linux journey.

I use firefox as well, on linux mint, not windows. So if you use windows, that may be the culprit. I haven’t used it in a long time so i don’t know if that could be the case.

It always works for me to just paste with ctrl+shift+v directly in the terminal window of the web gui.

The linked repository is unmaintained, and some of the scripts are broken as a result.
The scripts have moved to this repository.
Last time i used then they worked fine.
Try the scripts in the new one, and if they still give you errors let me know and i’ll be happy to try and help you.
Also, please don’t run scripts from the internet without reading trough them first. Even from a trusted source. You never know what random people could have written in there. 😅