RhinoGold 2.0 Service Release 2 available free for all users.
If you are a RhinoGold 2.0 user, install this file to upgrade to RhinoGold 2.0 SR2. (Download Service Release Pack 2)
If you are a RhinoGold 1.0 User, upgrade for free. (Download full installer)
But if you are not yet a RhinoGold user, get to know more about RhinoGold by clicking here.