How do I change a plug-in in Cubase Studio 5 for Mac

I had a plug-in trial version of Antares Auto-tune installed in cubase it ran out and I have a full version but its not the Antarese. I believe i installed it and such but i can’t get antares out of Cubase and its not recognizing the new version. I’m new to messin with macs so any help would be great.