Hi,
Thank you for posting in Symantec community.
I would like to answer your query.
Q, Can I know the upgrade steps from LUA 2.3.1/2.3.2 to 2.3.3?
--> LUA 2.3.4 is the latest version .You can upgrade from 2.2.2.9 through 2.3.2 to 2.3.3. It's important to know what's the exact LUA version you currently running?
Downloading LiveUpdate Administrator
http://www.symantec.com/docs/TECH134809
Take a backup prior to upgrade:
How to backup and restore LiveUpdate Administrator (LUA) configuration in LUA 2.3
http://www.symantec.com/docs/TECH159239