Using ARPG8R on macOS Catalina or later

1. Open a terminal window and run this:

[VST]
sudo xattr -rd com.apple.quarantine /Library/Audio/Plug-ins/VST/ARPG8R64.vst

[AU]
sudo xattr -rd com.apple.quarantine /Library/Audio/Plug-ins/Components/ARPG8R0951.component

[AU MIDI FX]
sudo xattr -rd com.apple.quarantine /Library/Audio/Plug-ins/Components/ARPG8R.component

(The plugin folder can be "/Users/xxxx/Library/Audio/Plug-ins/" in addition to the above.)

2. Rescan VST plug-ins on your DAW.