On your previous Mac installation, SoundSource stores license information in the macOS Keychain. If you migrated using Time Machine, the license may already be active.
macOS updates sometimes reset permissions, not licenses. Re-enter your key. If that fails, the update may have broken SoundSource entirely—download the latest version from Rogue Amoeba (compatible with your new macOS). soundsource license key
If you’ve been looking for a way to truly master your Mac’s audio, you’ve likely stumbled upon SoundSource . Developed by the audio experts at Rogue Amoeba On your previous Mac installation