Suggest since Airfoil is now retired there Airfoil for Mac Release Notes - Rogue Amoeba
: Updated the Audio Capture Engine (ACE) to improve audio reliability and handle system-wide audio capture more smoothly. Airfoil 5.10.5
Even as a legacy version, Airfoil 5.10.5 provides the essential toolkit for whole-house audio: Suggest since Airfoil is now retired there Airfoil