Forum:New xbox, DLC problem

Whats up guys, I've been away for awhile, and havent played Borderland since before x-mas due to getting the RROD and not having time/spare money to fix it. Yesterday I got a new Xbox, and I went online and dowloaded Robot Revelution or whatever its called and the update that makes all the main game characters higher level (which was an awesome unexpected suprise). My problem is since this is not the original Xbox 360 I downloaded Knoxx on I can't get it to work. I tried re-downloading it, deleting the old dowload on my hardrive and redownloaded it, but it doesnt work. It works of course If I'm on xbox live, but the problem is 99% of the time I don't have xbox live available since my net is in the living room, and the xbox is in the basement. Am I screwed and can never play Knox again (I'm itchin to farm Crawmerax and Armory since I've still never found a pearl even though I've done them both 50+ times) or is there a way to get it to work? Oh and Zombie and Underdome work fine, but they were not downloaded online, I had bought the disc, but they didnt need to be re-installed.