The "Plug-Ins" folder is the standard place to ╥install╙ Acrobat plug-ins. After installing a plug-in you need to Quit and restart Acrobat Exchange or Reader.
To install Acrobat Plug-Ins
Place the plug-in inside the ╥Plug-Ins╙ folder within the ╥Adobe Acrobat╙ folder.
To un-install Acrobat Plug-Ins: Drag the particular Acrobat plug-in you want to un-install from the ╥Plug-Ins╙ folder to the ╥Optional Plug-Ins╙ folder.
Note: For Acrobat Exchange 2.0, the name of the parent folder was "Adobe Acrobat 2.0." Not all plug-ins are designed to work with Acrobat Reader 2.1 and Acrobat Reader 2.0 does not support plug-ins at all.