I'm trying to use online installer but it doesn't run on my PC. I don't know if I need to use CMD or something
Even no beta version has been never released what stable version you're talking about. It just doesn't exist. Or do you have but you don't want to give it to others? Give it to try!
I have installed edge chromium and have been using it for a few days. Honestly, it is very rudimentary at the moment. Several features are lacking and to be able to fully compete with chrome, it needs a hell of more work. It is right now, at its infancy.