Unfortunately, no one told us that it was going to be removed, but I believe this is because they are going to post another version - probably will be called 3.1(2b) and the reason is because of a defect - CSCdv43218.
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.