Wormerine

If you talked to him right after entering (and not signing up to be a contender), your response to him is "I will come back once I sign up for the fight". I came to him after initial fight in the arena. You might be able to go to him even before that, after talking to the caretaker of the arena.

Hi!
 
Game Download means - game download. You get the game, which you can download on April the 3rd. Plus expansions once they are done after release and all the other goodies.
 
Backer beta was part of fig campaign and ability to back the game ended earlier this week, before announcing release days, and opening preorders. Someone might clarify it, but I don’t think there is a way to get access to backer beta anymore.