I am trying to install Rhino 6 in my PC but still is waiting for me to log in, in fact I am logged.
That doesn’t make sense.
Running the installer requires that you elevate to local Administrator rights. That’s a Windows requirement for installing software.
After Rhino is installed and you start it, if you choose to place your license in the Cloud Zoo associated with a Rhino login account, then you will do that then.
That happens AFTER Rhino is installed.