Jotamide
Quick tip, what version of DOA3 you'll download is tied to your console's region, not your accounts. So anyone trying to get the Japan-only 3.1 patch—the tournament version of the game—can only do so on a Japanese console.
The only workaround is by sticking in a Japanese disc, which will override the console region and net you 3.1 instead.
Of course, this'll probably only matter to hardcore DOA players who actually played 3.1 competitively.