Adding the Patch no CD for flight sim 2004

[Joarmy100]

Hello everyone I have a question; First of all my game its totaly legal Flight Simulator has 4 disc but the disc #4 is requiered to play. My disc#4 has lots of scratches that the Cd rom can't read and its also unable to be fixed. and I download the update for Flight Simulator then I when to here and I see 3 verson 9.1 , 9.0 , 9.0 so I select the first one but its scroll me down so I click in the {i} and then put a page with Mirror 1,2,3,4,5 then I click the first to download it then appears Mirror 1,2,3,4,5,6,7,8,9,10. I really need help cuz I don't understand this then when I download it what should I do with it ? I need the steps please.

Thanks