All the files are in ZIP format. (Click the icon ZIP to download)
 
For the recolorings of existing objects in the game the sims 2 and the meshes (Files PACKAGED), you have to unzip them in the file : documents/Eagames/The sims2/downloads.

For objects created by others users, you have to download the mesh on their site and then download recolorings. (A link will steer you towards the concerned site).
 
For houses, wallpapers and floors (Files SIMS2PACK), you have to unzip the files (wherever on your PC), then to double-click on the file SIMS2PACK. Files will be   automatically installed in your game.

So that certain recolorings work in your game, you have to download Color Enable Package.