Hi,
Probably you have already read https://support.symantec.com/en_US/article.DOC9408.html "Supported paths to version 10.6.2"?
I personaly took this update path: ... 10.6.0-7 -> 10.6.1-2 (-> only in test 10.6.1-3) -> 10.6.1-4 -> 10.6.2-3
But its quite easy, "update list" will show you the repository online available to upgrade. Only supported or nessesarry steps/versions in between will be shown.
To keep downtime to a minimum use "update download --verison ..." and, as you know always start with cc ;-)
Thomas