How To Update Macos High Sierra 10.13.6 To 10.15

Report: Updating macOS High Sierra 10.13.6 to macOS Catalina 10.15

Date: October 2023 (updated for historical context) Prepared For: Users running macOS High Sierra 10.13.6 Subject: Feasibility, prerequisites, and step-by-step procedure for upgrading to macOS 10.15 (Catalina)

Good luck, and enjoy macOS Catalina!

• If you prefer a clean install or need to upgrade multiple Macs, create a bootable USB installer (16 GB USB drive):

  The "Should You?" Verdict

  Do the upgrade IF:

  10) Troubleshooting & rollback

  • If the Mac won’t boot after upgrade: boot into Safe Mode (hold Shift at startup) to troubleshoot.
  • To revert to High Sierra:

    Also, check for firmware updates for your Mac (these sometimes get bundled with macOS updates). Keeping your current OS as updated as possible (10.13.6 is fine, but ensure it’s the latest security update) smooths the transition. how to update macos high sierra 10.13.6 to 10.15

    Time Machine is your only safe way back: Report: Updating macOS High Sierra 10