Restarting macOS Core Audio will show the Virtual Audio Device in Device Select.
Open Terminal
Paste sudo launchctl kickstart -k system/com.apple.audio.coreaudiod
If you're on a newer Mac and that command isn't recognized, try: sudo launchctl stop com.apple.audio.coreaudiod && sudo launchctl start com.apple.audio.coreaudiod
Dirac Virtual Audio Device should appear in Device Select now