Pro Tools 12.8.3 was developed in close conjunction with Apple to support High Sierra and the . Pro Tools 12 System Requirements - Knowledge Base
: Developed in collaboration with Apple to enhance playback performance specifically for iMac Pro computers. Enhanced Video Support Pro Tools 12.8 3 Mac Download
, primarily focused on stability and hardware-specific optimizations for modern systems at that time. Key Features and Fixes macOS High Sierra Support Pro Tools 12