After i uninstall my sims2, i can't install it again..?

i bought sims 2 through direct download. after several customs download from other site,the game stop working properly, so i have to uninstalled it. then i wanted to reinstall it again, but when i try to search for install button in my ea folder, there is none! how i am i supposed to get the game back? do i have to download it again from ea site? it s a waste of time if i have to start it all over again..