This isnt so much a deal but more misc so
XNA Games Launcher on Xbox LIVE
Downloading the new XNA Games takes a few extra steps.
1) Download XNA Creators Club Game Launcher (Marketplace/Game Store/All Games/XNA Creators Club). Ignore the others.
(Note: If you use "XNA Game Launcher" or "XNA Game Studio Connect", you'll be told you need a Creators Club membership linked to your profile.)
2) Browse to My Games (Games/Games Library/My Games) and twist to XNA Creators Club.
3) Press Y to Download Games
4) Choose a game to download like any other game.