However, because macOS Catalina introduces radical architectural changes—most notably the complete removal of support for older 32-bit software—you must prepare your Mac carefully before clicking install.
Before upgrading, go to Apple Menu > About This Mac > System Report > Software > Applications . Look for the "64-bit" column. If it says "No," that app will be deleted or stop working immediately after the upgrade (Adobe CS6, older Microsoft Office, many classic games).
If you have a Fusion Drive (iMac, some Mac minis), the installer will handle it automatically. Do not attempt to split it. how to update macos high sierra 10.13.6 to 10.15
Once your desktop loads, go to Apple Menu > System Preferences > Software Update to catch up on any minor security patches released for Catalina (bringing you to the final version, 10.15.7).
Updating your Mac to macOS 10.15 is a straightforward process that requires some preparation and attention to detail. By following the steps outlined in this article, you can ensure a smooth and successful update experience. Enjoy exploring the new features and improvements in macOS 10.15! If it says "No," that app will be
softwareupdate --list-full-installers softwareupdate --fetch-full-installer --full-installer-version 10.15.7
Type your admin username and password.
If your Mac is older than the models listed above, you cannot install Catalina. Your final supported version is High Sierra or Mojave (10.14).