This will depend on the type of UC500 you are using. For example, the 8-user UC500 can support 8+2=10 IP Phones.
The 2 floating licenses are typically provided for remote teleworker/CIPC/7921 IP Phone scenario, but they can be used to support any kind of IP Phones. As far as I know the teleworkers connections can be concurrent.
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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.