How to install geph on Ubuntu without using flatpak?

Hey everyone! I am using Ubuntu 22 and trying to install Geph vpn using flatpak. I've noticed that in my country - Iran - flathub and all services related to flatpak are blocked and censored which means I cannot download and install Geph using flatpak. The question is that is there any when to use, install or compile Geph vpn without using flatpak?