Using purevpn service for a newbie

I install the addon purevpn, but it seems not working well.
Any solution with this addon or an other one?

There are reports that openvpn with Brian Hornsby’s Addon works well

zomboided addon used to work with purevpn but they removed automatic support because of too many changes. purevpn can be set up manually with the zomboided addon though

zomboided had recently abandoned to follow purevpn. I tried to do this manually (UserDefined) but this doesn’t work.
At last, I get DNS trouble (domain resolution not working).
Any solution?