Licensing in UCM is currently done by Device License Units (DLUs). Each phone - and some other features - consume a certain quantity of DLUs that are taken from a pool. When the device is deleted those DLUs assigned to it are returned to the pool. You purchase DLUs from Cisco and install the license file on the UCM Publisher node. Note that this licensing model is in the process of changing to become more user/set-centric. Starting with 7.1(5) and 8.0(1) you purchase either a UCL or UWL seat. A UCL or UWL Standard seat entitles you to one phone for that user. You can purchase adjunct device licenses under UCL or upgrade the seat to UWL Professional to get additional devices for that user. Both of these new programs have separate concepts for public space (e.g. meeting rooms) and analog ports.
As for CME it is done entirely on paper currently. I'm sure this will change but for now all you do is order the appropriate phone SKU that includes a CME entitlement license.
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.