You will want to go into Macintosh HD/Library/Audio/plug-ins/VST and VST3 and remove any instances of the Vocalign Demo that you may have installed, should this be the problem. If you need to, you can move all of your plug-ins into a VST and VST3 folder on your desktop, that you create, so that your VST and VST3 folders under "Plug-ins" are empty. Once you open Studio One successfully, you can go into Studio One>Preferences>Locations>VST plug-ins and press the "Reset Blacklist" button. You an then add your plug-ins back a few at a time until you identify the one that is causing the issue. You will then want to contact the manufacturer of that plug-in for assistance.