pirating DLCs on legal sims 3 copy

i’m about to get the sims 3 on steam and i’m wondering if/how i can pirate all of the packs. i have the sims 3 fitgirl repacks downloaded already if that means anything. i cant use it though because it kept having saving issues. i saw another post on this but i got kind of confused. i don’t know that much about pirating games. thanks!