To use recolored objects in your game, you need the ObjectColorEnabler (CEP) from the SimPE Creators.

*You need the basic objects to use the other color options. The bookcases probably need the "University" addon.
**Premium Part: The computer probably needs the "Univerity" addon
*** Premium Addition: These additional color options for the premium set are free to download, but work only together with the premiumpart as base set.
>>install info