Copy the unzipped *.package files (objects, walls, floors) to My Documents\EA Games\The Sims 2\Downloads\... You can create subdirectories. If the directory “Downloads” don’t extist, please, create it by hand.
The new meshes and recolored objects for The Sims 2 are in Beta stage. Use at your own risk. For some objects, you'll need the Color Enabler Packages (CEP) installed on your computer (http://sims.ambertation.de/index.shtml). The objects are made with SimPE and the MTS2 Mesh Tool. I send many thanks to the great developer who make it possible to offer new stuff for Sims2.