Is it ok to download store stuff from other sites?

so i was looking for something and i didn't find it here but found it somewhere else. it's a store pack. can i download it knowing everything i have on my sims 3 is from you guys. will that mess up my game?

No, it won't mess up your game when it is from a reliable source.

In the meantime, we also have compiled a "complete store torrent". See this here, if you like.
https://games4theworld.forumotion.com/t24185-the-sims-3-the-complete-store-out-now