How To Update Macos High Sierra 10.13.6 To 10.15 Jun 2026

Open the App Store and go to “Updates.” Install all pending updates for your existing High Sierra apps. This reduces compatibility issues after the OS upgrade.

If your Mac is older than 2012, you cannot install Catalina natively. Your final supported version is High Sierra (10.13.6) or Mojave (10.14) on some 2010-2011 models with patchers – but that’s beyond this guide. how to update macos high sierra 10.13.6 to 10.15