Copy the four data files (typically named 545408A700000001 through ...04 ) into the corresponding path on your Xbox 360 HDD.
Extract Disc 1 (Install Disc) using a tool like Xbox Backup Creator or Horizon. Grand Theft Auto V [Jtag/Rgh DLC]
💡 Use a FAT32 formatted USB drive to transfer these files if you are not using FTP. Copy the four data files (typically named 545408A700000001