Open Finder
Select Go → Go to Folder
Paste /Library/Audio/Plug-Ins
If you have a folder named "HAL", restart your device to make sure your installation is complete, and then check for the Dirac Virtual Audio Device again.
If you do not have the "HAL" folder, create one and reinstall the Dirac Processor. Then check whether VAD.driver appears in the HAL folder.
If the above does not work and you have a "HAL" folder, delete it, install Processor again, and then restart your device.