If you’re still running macOS High Sierra 10.13.6, you’ve likely enjoyed a stable, reliable system for years. However, as software evolves, you may find that newer apps, browser updates, and security patches are no longer supporting your current OS. Updating to macOS Catalina (10.15) is a logical jump—but it’s also a significant one.
architecture. This update is free and generally straightforward if your hardware is compatible. Apple Support Community 1. Check Hardware Compatibility how to update macos high sierra 10.13.6 to 10.15
Back Up Your Data: Use Time Machine to create a full system backup before proceeding. The Complete Guide: How to Update macOS High Sierra 10