On a PC with a standard install they would be here:
C:Program FilesAdobeAdobe After Effects CS6Support FilesPlug-ins
can't help you with a MAC
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.