Hello Jimmy,
please use the users@einsteintoolkit.org list to respond.
A quick Google search does find a couple of hits but nothing that really looks exactly like this.
I am afraid I cannot reproduce the issue. You are running Ubuntu 18.04 LTS curl version 7.47.0, are you?
Can you access
https://raw.githubusercontent.com/gridaphobe/CRL/ET_2020_11/GetComponents
in your browser?
Could it be some sort of proxy or firewall issue? Can you include the screen output of
curl -v https://raw.githubusercontent.com/gridaphobe/CRL/ET_2020_11/GetComponents >/dev/null
Yours, Roland