To load the newly installed Voice Changer plug-in within Adobe Premiere, you can follow the steps below:
1) Open a new project in Adobe Premiere Pro, go to Preferences > Audio.
2) Click to open the "Audio Plug-in Manager..." at the bottom of the launched window.
3) On the Audio Plug-in Manager window you have to select the VST plug-in folder.
By default, accusonus products will be installed in the system's VST plug-in folder, which is:
In Windows, C:\Program Files\Steinberg\VstPlugins
In macOS, /Library/Audio/Plug-Ins/VST
4) Under the Available Plug-Ins section click the Scan for Plug-ins button.
Once the scanning is complete, make sure that Voice Changer is enabled and press the 'OK' button to return to the main Adobe Premiere Pro view.
You should be able to access the plug-in from within the effects panel and audio track mixer.