1. Open the .pkg file and follow the installer. It installs DUCK! as AU and VST3. Warning that macOS can't check the developer? Go to System Settings → Privacy & Security, click Open Anyway and run it again.
2. Restart your DAW or rescan plug-ins. DUCK! shows up under Say Less Audio.
3. Activate: put DUCK! on a track and enter your license key from My products. Needs internet once.

1. Run the Setup .exe and follow the installer. It installs DUCK! as VST3. Seeing "Windows protected your PC"? Click More info → Run anyway.
2. Restart your DAW or rescan plug-ins. DUCK! shows up under Say Less Audio.
3. Activate: put DUCK! on a track and enter your license key from My products. Needs internet once.

New computer? Deactivate DUCK! in the plug-in on the old one first, or ask support to free it.