It works on arch?
If you can compile it, yes. I believe there might be an unofficial client for the AUR, but I won't swear to that.
There is, but i coudnt find yet why im getting errors installing that software
One will always get errors trying to download something simply
I'm successfully running it on arch. You just follow the compilation instructions but make sure you change anything that says "haveno-dex" to "haveno-reto" wile doing it.