Medal of Honor Warfighter limited edition code for Battlefield 4 beta

I redeemed the Medal of Honor Warfighter code that gave me access to the Battlefield 4 beta, U.S. Navy sniper for multilayer, and the Zero Dark Thirty Map pack. I can't find where to download the beta. I downloaded the code whenever I got the game Warfighter so I could play online, but now that's the battlefield 4 beta is out. I can not figure out where to download the game. I searched for it on Xbox search bar but there is no button the says download battlefield 4 beta.