The world of macOS is one of continual evolution, with Apple consistently pushing the boundaries of what its operating systems can do. Among the most notable releases in recent years are macOS Catalina and macOS Big Sur. These two versions have not only refined the user experience but have also introduced significant changes in how Apple envisions the future of its desktop and laptop ecosystem. This essay aims to provide an in-depth look at both macOS Catalina and Big Sur, focusing on their features, improvements, and the unique aspects of their releases, including the concept of a 1015 DMG exclusive.