Much of the "DLC" for Forza 4 actually comes from Disc 2. If you are missing "Essential" cars, they might be on the second disc rather than a digital download. Insert Disc 1. Go to the Main Menu and select . Choose your USB Storage Device as the destination. 3. Transfer DLC Files via PC (Horizon/Velocity)
USB Root \ Content \ 0000000000000000 \ 4D530910 \ 00000002 \ Directory Breakdown forza motorsport 4 dlc download fix usb