Alexander, I downloaded warcraft 2 and was able to play it yesterday. Now today, I go to play it and it says I need to insert the game into the computer, but i never took it out. how do I get past that?

I am having a little trouble playing my game. I downloaded d fend yesterday and was finally able to play my old game of Warcraft 2. I played for a bit but then exited out of everything. I went to go play it today but something pops up and says I need to have the disc in the computer for it to work. …