Empty folders and can't install games?

So I have read the how to install thread numerous times and either I'm not comprehending something or there's a serious error. I downloaded the base game from pirate bay and then I looked at the video of how to install. I downloaded the daemon lite program but that is as far as it goes. When I try to mount image the game isn't an option so there for I can't install anything. I thought maybe I need to unzip the folder or something but it says that the folder is invalid? I don't know if the fact that I don't have a disk drive means anything. I do have a cd drive that plugs into a usb port if that is something I need to do. Is there anything else I'm supposed to download before I try to install?

Edit: The first time I tried to download I got an empty zipped folder and now I have a button which seems like it would lead you to setup but ninstead It is giving me pop up ads and tons on the sides and top. I also can't access certain sites for some reason and It made v9.com my homepage even though I have it set to something else. I have no idea how to get rid of any of it.