macOS Catalina 10.15.6 free one-click download DMG image setup for Mac. Catalina 10.15 is the latest Apply operating system that is known for its best performance, stability and security features. macOS Catalina 10.15.6 Overview Catalina is the latest 2020 operating system from Apple that delivers better performance, improved security and numerous enhancements. It is a reliable and stable macOS release with a variety of bug fixes and improved workflow. The Read More …