If you're running on Call Manager I'd reccomend it since the updated TSP (and ones coming down the pike) require 126 to work. If you're not using Call Manager, there's no real pressing need to upgrade from 102 to 126 right away.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...