Copy PC game

I bought the sims 3 a few days ago and my friend wanted to copy the game and ive wasted 10 cds trying to copy it. I have a mac and im using disk utilities to copy it. The game copies perfectly but when im going to play it after installing it it seems to say that “I dont have the original Cd” im trying to make one copy and idk what im doing wrong can someone help me please.

Thanks, Jose.