User blog:SerbianFalloutFan/Morrowind and Oblivion download errors

Ok, this is my first post on TES wiki, even though I've played all games in the series. Recently I wanted to replay Morrowind and Oblivion, but I traded both games some time ago. I wanted to buy the Anthology, but it's sold out in my country. So I decided to download goty editions of both games on the Iso zone site (I'm not proud of that decision). I installed both games and all expansions but when I tried to play them it said disc is required to play. Can anyone help. please?