If you are running Max/MSP 5.0 or later then you should use the externals in the 5.0(INTEL) folder.  Otherwise, you should download an earlier version of the UBC Max/MSP/Jitter Toolbox which will run on Max 4.5 or 4.6: 

The externals (once unzipped) should be placed in:
/Applications/Max5/Cycling '74/msp-externals/

