Ruby is not installed on your PC.
You login via a local web address.
If you try to install it on your own computer, it will ask for a serial number, and you will still not be able to control the laser.
The details are covered under the heading “Working remotely” in the Ruby user manual.
However, I am increasingly of the opinion that the remote access is only useful for training, not for actually cutting anything.
If you don’t already have a Ruby username, you can only get one when one of the laser techs is at the Laser PC.