In addition, when you go to download something, there is a column on the right side of the page that lists the expansions etc. that are in the download. I think the only thing not mentioned is CC but I can't swear to that. Also, many builders put in the "comments" section on the left side under the lot stats, what they may have added, whether it has CC or mods or uses MOO, so anyone wishing to download can make a really informed decision. I like that a lot.