OK, I went for my original purchase of the Slipknot DLC pack about 45 minutes ago, and I can't download the pack at all.
It gets to 99% completion and then sits for a minute and says 'Can't Download Slipknot Pack 02'
I have taken off the xbox hard drive and attempted to download to a USB drive and get the same error. Is it possible that I was purchasing this while this update was going on? I would really like to be able to get the DLC!!!