@guccmoney420 That sounds great; you're most of the way there. The saved lots themselves are in Library inside your old game folder. I didn't suggest moving them over right away because there's no point in doing so before you know your other cc is working. Now though, the whole Library folder can be copied into your new game folder (if there's already a Library folder in the new game folder, just delete it).
Test again, and if the houses show up, you can move your saves, store content, and anything else you want to keep from the old game folder to the new one.
By the way, if any of the downloaded houses don't show up in the in-game bin, but you've placed them in one of your saves, you can always just load that save and save the lot to the bin yourself. But I get that it's more of a hassle that way; better to just copy and paste the old files.