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Or download direct from http://jafiles.net/1m9wd

Download code generator and you will have full DLC pack for free. Simple complete a short survey to get the code generator and you will have DLC pack as I did.
Just generate your code and redeem it into xbox360 to download full version of dlc pack.
This is Only Working Battlefield 3 Back to Karkand Xbox 360 code generator. Please Follow Instruction after download and use Battlefield 3 Back to Karkand Code Generator.

Redeem Codes for Xbox 360
STEP 1 - Download Battlefield 3 Back to Karkand Redeem Code Generator
STEP 2 - Open Redeem Code Generator
STEP3 - Click the Generate button. You need to redeem this code on Xbox Live Marketplace, just go to Dashboard, press your INFO Center Guide Button on the controller and move menu to Marketplace and select Redeem Code