Rhinojewel 5.5 does not have the installation password (CD-key) and registration of the license is linked uniquely to the USB hardware lock (dongle) key used to run it.
Registration process is simple:
Right click the golden rhino icon in the status bar and select "Show...":
In case you do not have Internet connection on the computer where program is installed, open the third tab for alternative instructions.
Press the button "Check for updates" and if your license is not registered, there will be another message prompting you to do it: