The Sims 2
Before using custom furniture you will need to enable custom content in your game AND download and install the CEP from Mod The Sims.
You will also need to install the CEP again if you ever reinstall your game or add a new expansion or stuff pack.
If you have problems installing or using custom content please see these external links for futher information:
All new mesh objects list the mesh complexity in terms of the number of faces and vertices which make up the object's polygon count.
More information about this issue is available in this support topic:
Download the set by clicking on the photo above, or you can download single objects below