Lets just say "In Theory" Green lights will mean all your stuff is the latest version. Sure wouldn't surprise me if there were glitches.
I keep a back up file of the Command Center Download folder on a back up drive. Everything I ever downloaded is backed up there. I think it's something like 50 GB now.
You can quickly see all the versions of each item.
Most other than Sonar itself have not updated since CCC came along, but some things have 2 or more files each with the version number so easy to tell which is that latest. But if you open the Z3tA2 it will show whatever the latest version is. Click on the Name icon in the upper left. = rgc:audio z3ta+
Most of us back in November also downloaded directly from or "My Accounts" page and copied all the serial numbers as well. So you might want to do that if you can spare the bandwidth as those for sure are the latest versions.
You could then compare the version numbers with those in the CCC Download folder.