Sims 2 Expansion Packs install.... help!!!!!!!!!!!!!!!!! (that cd 4 thing)?

I have installed Sims 2 (i downloaded it and put a crack) and it works fine. I have downloaded Glamour Life Stuff and i tried to instll it. The instalation works fast until i get to the end... It says to insert CD 4. I insert it, but if i press ok the window asppears again and again and again... If i press Close (that X) it cancels the installation... :( Help me pls