yurikoles [1] filed a request to merge protonvpn-cli-ng [2] into protonvpn-cli [3]:

Built from same source as package from ProtonVPN team.

This is not true. protonvpn-cli-ng is built from <https://github.com/ProtonVPN/linux-cli-community>. protonvpn-cli is built from <https://github.com/ProtonVPN/linux-cli>. I hope that this community package is not removed/merged. I have had consistent failures when I have tried to move to the newer client, but this one stil works. They function in fundamentally different ways.

[1] https://aur.archlinux.org/account/yurikoles/ [2] https://aur.archlinux.org/pkgbase/protonvpn-cli-ng/ [3] https://aur.archlinux.org/pkgbase/protonvpn-cli/