After using that command protonvpn gui opens but not working at all. And that error log I have attached in previous post.
Please, no pictures from terminal in- and output.
Open Issues on github.
I have not changed any firewall setting.
It's just an idea, but shut down the FW and restart proton.
To try and help you - https://protonvpn.com/support/linux-vpn-setup/
On that page, it clearly states - We strongly recommend using our Linux VPN command-line tool which makes it easy to connect on Linux machines
Strange , it is working for me
If not installed using pamac , remove protonvpn-gui
Reinstall protonvpn-gui from pamac
Enter email, password in the gui app
Dont modify any settings
Press quick connect
It will work
This issue is from 7 months ago so hopefully the OP has solved it by now.
If not, using pamac to install it, is unlikely to be an actual solution....