On the OS X plug-ins can be found in
/Library/Audio/Plug-Ins/Components/
and
/Library/Audio/Plug-Ins/VST3
Delete “VocALignProject.____” or "VocALignPro.____" plug-in files as appropriate.
(if you installed a plug-in by mistake, but you own another, of course you want to keep the plug-in you own)