It will not run on macOS Catalina or newer because it is a 32-bit application, and those systems require 64-bit software. 🌟 Key Features & Performance
Pro Tools HD 10.3.10 has a very specific "sweet spot" for operating systems. It is the last official update for the Pro Tools 10 family and is primarily designed for older Mac environments. Pro Tools 10.3 System Requirements - Knowledge Base - Avid
: It typically includes the Avid Virtual Instruments (Boom, Vacuum, Xpand!2) and the AIR Creative Collection .