rubicon 2008

I'm using the old Sonar Pro, which suits my needs quite adequately. However, with the software, Unify, I'm having a problem with sonar crashing when I convert midi/Unify data to a .wav file on a track. This only happens with Unify. The tech support suggested resetting .vst3 in Sonar. Does anyone know where to find this 'reset' in Sonar?