So we recently updated our Adobe Suite to the Creative Cloud package (YAY!). However, when we do this, our plug-ins don't come with us, so we had to find the proper way to reinstall them.
I found this page that outlines the best ways to do this for both Mac & PC from Toolfarm: In Depth: Plug-ins Adobe After Effects CC and Premiere Pro CC
Basically, you have to follow this path:
Macintosh HD > Library > Application Support > Adobe > Common > Plug-ins > 7.0 > MediaCore
Once you have that path, you copy/paste your plug-in folders into the MediaCore folder. Then voilĂ ! Your plug-ins should be ready to go after restarting that application :)