buying vampire expansion pack

if i buy the vampire expansion pack will it work with the downloaded copies i did that with sims 3 with all downloaded but bought into the future and game worked fine.

I have read somewhere before that you can't install packs you've bought with the cracked game.

ok i didnt' buy it yet i am still tryin to do the zclient i made my account on zloemu.tk
so we will see.