For some reason Epic Games do not let you download the extra content if you're outside of U.S. Happened to some of my friends here while being deployed so -IT IS- an issue to those who have access to LIVE, just a heads up.
Try anywhere outside the US. Currently, I am deployed in Iraq, without access to Live, friends in the UK, Italy, Germany, France, and Spain are saying they cannot get it in their region, and we all have American Xbox 360's. Thankfully, I will be going through the states back to Japan, so I may get my opportunity to download what I been missing.