If software is deferred, it's usually because those versions aren't supported anymore, or they contain security vulnerabilities that have been patched in a later release and Cisco doesn't want the vulnerable software to be available anymore. The most recent series of vulnerabilities affected a lot of TC software releases, so most got deferred because of this. I suggest you use TC6.3.3 instead, as that release contains all the most recent fixes for several security vulnerabilities in the TC6.x software series. Details about TC6.3.3 can be found in the TC6 release notes.
Any particular reason you're wanting to download TC6.2? Because it is deferred, you're not going to find a download for it on Cisco's site or anywhere else, unless someone happens to still have a copy themselves and sends it to you.
I know, I referred to it as just TC, as TCNC is the same software and features as regular TC software, except without encryption. Still, everything I said earlier applies, no matter if you're running TC, TCNC, or the versions for CUCM. Deferred software is not available and there is not download for them anymore. As I said, the recent security vulnerabilities causes almost all versions of the TC software, including TCNC, to be removed for download. The only available versions are those where the vulnerabilities have been patched.
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.