If Logic Pro X displays the message:
The plug-in named "Revoice Pro" isn't available in your system.
Choose another plug-in, or quit Logic Pro X and install the plug-in on your computer in order to use it in the project.
This will install the Revoice Pro plug-ins and resolve the issue.
Please exit Logic Pro X and launch the Revoice Pro standalone application once.
This will install the Revoice Pro plug-ins and resolve the issue.