Using the CEP - Sims 2
Credits: The creation of these packages wouldn't be possible without the joint efforts of Quaxi, RGiles and Numenor.
When downloading object recolors here at The Sims Resource, many of them will require this third party software to enable them in your game.
Important! You only need to download/install the CEP Enabler once - not for every object you download!
Go here for the official download location and installation instructions.