If you are using the 64 bit version of The Sims 2 Complete Collection, I wanted to note that they changed the paths somewhat.
For the 64 bit version the path is Contents/Assets/Expansion Packs
Complete instructions for installing CEP in Sims2 Super Collection Mac for the 64 Bit Version.
a) _EnableColorOptionsGMND.package:
Place the file "_EnableColorOptionsGMND.package" into your Sims Downloads folder:
~/Library/Containers/com.aspyr.sims2.appstore/Data/Library/Application Support/Aspyr/The Sims 2/Downloads
b) _EnableColorOptionsMMAT.package:
Open the Applications folder, then RIGHT CLICK The Sims 2 app, and select "Show package contents"
Navigate then to Contents/Assets/TSData/Res/Sims3D/
Place the file "_EnableColorOptionsMMAT.package" in that folder.
c) "Extra" folder:
Open it and you will find 2 subfolders, "MyDocuments" and "ProgramFiles".
c1) Open the "MyDocuments" folder and move the entire "zCEP-EXTRA" subfolder, along with the several files contained in it to:
Applications folder-->TheSims2-->"Show package contents"-->Contents/
c2) Open the "ProgramFiles" folder and move the entire "zCEP-EXTRA" subfolder, along with the several files contained in to:
Applications folder-->TheSims2-->"Show package contents"-->Contents/Assets/TSData/Res/CATALOG
CEP works fine as far as I can tell, once it is installed using these instructions
Download the Latest CEP at MTS
http://www.modthesims.info/download.php?t=92541