Start without Internet (Grand Theft Auto 4)

Download pirates.Working as usual,but it is.I have problems with the Internet,so sometimes it is not.And you want to play.I saw the video in YouTube you need to click on the home button and enable offline account or whatever it is called.The problem is that when you click it, nothing happens(the button is not broken).I am so confused.I hope here I will find a solution to this problem.