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Step 3) Download the torrent file: https://dss0.cc/alterwarez/download/pluto_t6_full_game.torrent
Step 4) Open the torrent file pluto_t6_full_game.torrent (from the previous step) it will open up your torrent client program and ask you where you'd like to save the game.
After that, you can find all dlc in the "zone" folder.
Do you mean 1 bank for every server available on plutonium? That will be hard, and imho losing of fun, cause there's no connection between two server administrated by two different people.
Read the error and you'll have the solution of your problem.
When you open Plutonium.exe, go on bo2 sub menu and click on the settings icon, then change the path of the game to the correct one (where bo2 basefile are).