This seems fine, remember to backup important data like the provisioning data. (TMSAgent backup) from TMS.
The TMSNG backend TMS database can be nice to have a copy of so you can roll back if something goes wrong.
However this is best practices and you probably already have control over this stuff.
All in all I don´t see any obvious issues with your plan, although there are a lot of potential things that can go wrong so therefore make backups! If something goes wrong you can always raise a TAC case and get assistance.
Thanks a lot for your prompt replay and kind support. Should I have release keys for VCS X6.1, as we received only Product Part Number like XXX-VCS-XXXX-XX from the partner, I suppose this is for VCS v.X7 only or we can use it for X6.1 and X7?
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.