If you need the update then you'll be prompted to install it. I'm not sure whether or not the most recent update was included with the PS3's GOTY edition, but the check should be made automatically every time you start the game.
The problem of Overlords, Albinos, and Reavers appearing well before the appropriate level is common across all platforms. Your options are basically to either deal with it, or uninstall Broken Steel until you are either close to level 20 or to the end of the vanilla game's main quest line.