You cant unless you register the lic to a non vmware mac address. Try it with out the lic as im pretty sure it comes with a 1 node license as standard. The unified communicator and phone messenger are all license via call manager not CUPS.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.