From GTA BOOM: “The Grand Theft Auto 5 modding scene is booming as ever, and in keeping with an age-old tradition that arose ever since we learned that the fabled story DLC will never arrive, the content of the latest major GTA Online DLC has been modded into the game’s single-player portion to allow solo players to enjoy the new goods.”

Source: N4G PC GTA Online After Hours Content Modded Into Single Player