proton-vpn-gtk-app from home:Rootum project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Rootum/openSUSE_Tumbleweed/home:Rootum.repo zypper refresh zypper install proton-vpn-gtk-app