This long-form guide will walk you through every stage: pre-upgrade checks, data backup, compatibility verification, the actual installation process, and post-upgrade troubleshooting. Before you spend an hour preparing, let’s ensure your hardware supports macOS Catalina. Apple dropped support for many older Macs in 10.15.
Once on Catalina, enjoy the modern macOS interface, tighter integration with iOS devices, and the comfort of knowing you’re no longer running an OS that’s half a decade old. Just remember: always keep a Time Machine backup, and if performance is sluggish after a week, consider clean-installing Catalina (erase and install from scratch) – but that’s a guide for another day. how to update macos high sierra 10.13.6 to 10.15
30 GB minimum.
However, this is not a “simple click update.” Because you are skipping two major OS versions (Mojave and Catalina), there are critical compatibility checks and preparation steps you must take before pressing the upgrade button. This long-form guide will walk you through every
If you’re still running macOS High Sierra 10.13.6 , you’re likely missing out on years of performance improvements, security patches, and modern features. Moving to macOS Catalina (10.15) represents a significant leap forward, introducing Sidecar (iPad as a second display), Screen Time, redesigned Apple Music and Podcasts apps, and the death of iTunes in favor of Finder-based device syncing. Once on Catalina, enjoy the modern macOS interface,