You don't need to do an update of Banter Pack, UNLESS you're a Russian player(a Russian translation was added in version 12) or a Korean player(a Korean translation was added in version 13).
No new content's been added after version 8, if I'm not mistaken.
If you have mods installed via Big World Project(automated install, biffing), NO, don't reinstall in the middle of the game.
If you have several mods installed manually(it means you ran Setup-Mod.exe for each mod), then yes, you can download v13, unpack it on top of the previous version, run re-install.
Again, I don't recommend it, if you do not need Korean/Russian/other translation.