I think you are right, with Premium the IVR ports are double the Agent seat till it reaches the platform capacity.
With the enhanced license Agent Seat count + maximum basic IVR pots (supported on the platform).
Basic IVR Ports Licensing—Basic IVR ports are not licensed and a given configuration may have as many Basic IVR ports as fit given the server on which the system is deployed and the mix of other features deployed on that server. Basic IVR ports (and only Basic IVR ports) are available in both the Standard and Enhanced packages.
I'll confirm that you can use the five-seat Enhanced bundle; the IVR ports are only limited to the server capacity. It's worth noting that CCX is the same software as IP IVR, just with different licenses. IP IVR has the same Advanced IVR port license as CCX Premium does.
One other option just for the record: Unity Connection can perform basic auto attendant/IVR functionality and, assuming G.711, support something like 250 ports on a server.
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.