Failed to install vray to sketchup

I been trying to upload ray to sketchup , both versions 2020, all trial versions downloaded via same login . it shows that there is an error:localhost 30304. Anybody knows what reason can cause that?

Usually, this means that you are not signed in, or did not exclude vrol.server in the firewall when installing.
In a browser, type ‘localhost:30304’
What do you see?

Which part of your profile is wrong or correct?

  1. The Web version of SketchUp cannot use any plugins.
  2. Macs with Nvidia graphics cards cannot run Mac OS X Mojave and newer.
  3. At least SketchUp 2021 needs Mojave or newer. I couldn’t find the 2020 requirements
  4. V-ray 5 requires MacOS 10.10.x Which Mac OS are you running