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With very little effort devices may be upgraded to Catalina using the provided recipe. 

Upgrading older versions

Devices running earlier versions (pre 10.8 Mountain Lion) will require updating twice; Apple recommend upgrading to El Capitan and then to Catalina.

Apple macOS Catalina Upgrade Guide

Apple's full list of macOS Catalina Compatible Devices


Full installer

Confirm the installer app is the complete installation (8+ GB) before continuing. If the app is less than 50MB, re-download the Install macOS  A full installer may be downloaded through Terminal on macOS 10.15 devices.  Example to download the 10.15.4 full installer to the Applications directory:

Download Full Installer
softwareupdate --fetch-full-installer --full-installer-version 10.15.4

Typically Apple only provide the latest point release of each Major OS version: 10.13.6, 10.14.6, etc.

Associate Fileset as a Kiosk association for the end users to install in their own time.


Re-running the Filesest

This Fileset adds a file to prevent re-running the installer. If the installer requires re-running, this file will need to be removed in advance:

rm -rf /var/db/.upgrade-to-catalina-fw-installed

  1. Download the Fileset attached to this recipe and import into FileWave: Upgrade macOS 10.15 Fileset

  2. Once imported into FileWave, open the Fileset to view the contents window; ensuring 'Hide unused folders' is selected
  3. In the Applications folder add the dowloaded 'Install macOS'; .fwplaceholder may be removed

  4. Associate to test machines
  5. Once tested, deploy to appropriate clients