Copy the four data files (typically named 545408A700000001 through ...04 ) into the corresponding path on your Xbox 360 HDD.
Locate the Content/0000000000000000/545408A7/00000002/ folder within the extracted files. Grand Theft Auto V [Jtag/Rgh DLC]
Use XM360 on your console to scan and "unlock" any DLC that appears as locked (grayed out). Copy the four data files (typically named 545408A700000001
Extract Disc 1 (Install Disc) using a tool like Xbox Backup Creator or Horizon. Grand Theft Auto V [Jtag/Rgh DLC]