Install to C:\Program Files (x86)\Maxis\The Sims\GameData\Skins
All Set Packs marked TS are exclusively for TS Only (BBW, Bootilicious, etc). If you download the TS Only versions for these pack items, you need to have none of the expansions below for the alternate outfits to show. However, outfits that come as individual outfits, such as the Fat Haute Couture set, have TS version named for everyday wear.
If you are unsure of how they work, look for the F, S, L, W, H before the 3-digit code. for example F001fafat indicates formalwear for a fat female adult sim. This indcation expansion are required.
If downloading The Sims Only Files, all CMX files should begin with a B for Body. If they do not, then these skins are set to recognize the main everyday outfit and appear automatically when your sims changes clothes. These The Sims Only files do not work with later expansions.
Hottie's TS files should only be used for The Sims Original through House Party. Once Hot Date is installed, these will no longer work properly.