I always create an ADOBe folder inside the Applications folder and put all my Adobe apps there. I also create an AE Plug-ins and PS Plug-Ins folder for the After Effects and Photoshop 3rd party plug-ins. Then I create aliases to these folders and put them into the correct Plug-Ins folder for the apps. This way I can share my plug-ins with other apps that might be able to use them and I only have to install them once.
Bear in mind that not all plug-ins from AE6 will work in 7.
Jim Kanter,
Digital Film Institute
http://www.dfilminst.com