In an OS X or macOS system:
Audio Units plug-ins can be found in Macintosh HD/Library/Audio/Plug-Ins/Components/
VST3 plug-ins can be found in Macintosh HD/Library/Audio/Plug-Ins/VST3
In these locations, delete “VocALignProject.____” or "VocALignPro.____" plug-in files as appropriate to uninstall.
(if you installed a plug-in by mistake, but you own another, of course you want to keep the plug-in you own)
In a Windows system (VST3 only)
Use the Uninstall option in Windows Settings > Apps > Apps & features