Since the plug-in is installed just like any application, open up Terminal and type: sudo find / -iname *.app. Once you locate the plug-in in the list, copy the line and use rm -rf PATH_COPIED. The software should be removed by now. Reboot your Mac to see the changes take effect.
Note: Make sure to copy only one line to avoid deleting other applications as well. Never use *.APP in combination with rm -rf because you will delete everything.
