STEP 1: Download and run the following uninstaller: http://download.slatedigital.com/repeater/Repeater_Uninstaller_Mac.zip
Alternatively, you can navigate to the following plugin paths and remove "Repeater":
Mac HD/Library/Audio/Plug-Ins/VST and remove Repeater.vst file.
Mac HD/Library/Audio/Plug-Ins/Components and remove the Repeater.component file.
Mac HD/Library/Application Support/Avid/Audio/Plug-Ins/D16 Group and remove the Repeater.aaxplugin file.
STEP 2: Go to /Library/Application Support/D16 Group.
If you have created user presets, make a backup of them and delete the Repeater.