If you are running Max/MSP 4.6 or later then you should use the externals in the 4.6(INTEL) or 4.6(PPC) folder.  Otherwise, use the externals in the 4.5(PPC) folder.  All the externals in the chosen folder should be moved to your externals folder: 

probably /Applications/MaxMSP/Cycling '74 folder/externals/
