If your VocAlign or RePitch VST3 plugin is definitely installed, but not displayed in REAPER, you may need to have REAPER rescan the VST plug-ins.
Open the REAPER Preferences panel and make sure the VST3 plug-ins paths includes /Library/Audio/Plug-Ins/VST3
Then click the Re-scan... button.
If these steps do not resolve, please:
- remove the plug-in path /Library/Audio/Plug-Ins/VST3
- click Apply at the bottom of the REAPER Preferences panel
- click OK at the bottom of the REAPER Preferences panel
- Reopen the REAPER Preferences panel
- add the plug-in path /Library/Audio/Plug-Ins/VST3 again
- click the Re-scan... button
- click Apply at the bottom of the REAPER Preferences panel
- click OK at the bottom of the REAPER Preferences panel