Since the LDAP integration changed on CCM 5.X and now we have MLA enabled by default, the CCMAdministrator, CCMSysUser and the accounts previously stored on AD, are now hosted on the local directory database, you can safely delete the Cisco OU if you are not using it, just remember to perform a Directory Synchronization after doing that.
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.