# if you are not upgrading all the subs to 8.6.2, in that case you have to re install all the subs and they will get the database copy from PUB(UCS), you will only miss the MOH files you have installed on individual server.
# yes you can swtich back to 7.1 on MCS after you get the DRS.
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.