Sims 2 downloaded objects..problems?

one thing you can do to ensure you're getting a valid download is to do this: when you're planning to download, it shows a small picture of exactly what you're downloading. If the picture just looks like a screenshot, it's likely to be dodgy. if you see one with a picture that looks as though it has been photoshopped and customized, it shows that it's valid. also, if the download contains items or elements from an expansion pack you don't have, the downloaded file can just dissapear or make ur game glitch. well hope this helps!! happy simming!!!