What gets installed

• /Library/Audio/Plug-Ins/VST3/Halo 2000 NL.vst3
• /Library/Audio/Plug-Ins/Components/Halo 2000 NL.component (Audio Unit)

Requirements

• macOS 10.13 or later
• A stereo insert. The plug-in is stereo-in / stereo-out only — one engine per channel is the whole point, so a mono instance is refused by design.

If Logic does not list the Audio Unit

Run killall -9 AudioComponentRegistrar and reopen it.