You need to purchase Real Speak sessions for your Unity Connection license, which increments your license file by LicRealspeakSessionsMax (the amount you ordered). You do not need to add Nuance to your UC install. I don't recall the specific part number. In your System Settings, under External Service - create a new service. We called ours Outlook Web Access and assigned the service capabilities "User access to email in third-party message store". In the User configuration, you then add an External Service Account to the user that wants this functionality; put the user in a COS that has the checked boxes "Allow Access to Advanced Features" and "Allow Access to email in third-party message stores". The online system guide help is good in documenting the entire process.
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.