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The instructions are a little bit dated. If you have a current robocode (1.7.3.5) you can just follow the instructions under "From standard Robocode" without step 1. If you start the rumble it downloads all available robots for you. But if you want to speedup this a little you can grab the latest botcollection under "Get the updates since ? till 20120307" (Participants_20120307.zip) for 1vs1 and for melee under "Melee Database" (ParticipantsMelee_20120307.zip). They are located on the same above page. Extract these files in your ../robocode../robots folder and you are set.

Yeah, I don't think the rumble accepts the latest Robocode versions (1.7.3.0 and 1.7.3.2 only). I've updated the link for the superpack to my dropbox public folder.

As for the next step up in targeting, try pattern matching or guess factor targeting. If you're using the iterative circular predictor then pattern matching is easy, just swap out the velocity/deltaheading each iteration with a value from the history that you think started at a similar situation/pattern. For guess factors check out the GuessFactor Targeting Tutorial.