A DMG (Disk Image) file is a compressed file that contains the macOS installation package. Downloading a DMG file can be helpful in various situations:

12.5GB (from OS X El Capitan 10.11.5 or later) to 18.5GB (from earlier versions). Clean Install: At least 20GB of available space. Compatible Models: MacBook: Early 2015 or newer. MacBook Air/Pro: Mid 2012 or newer. Mac mini / iMac: Late 2012 or newer. Mac Pro: Late 2013 or newer. 2. Official Download Methods

Your settings will open to confirm the download.

softwareupdate --fetch-full-installer --full-installer-version 10.15.7 to download the installer to your Applications folder. 🛠️ How to Create a DMG File Once you have the "Install macOS Catalina"

macOS Catalina was the first version of macOS to . If you rely on old software (like older versions of Adobe Creative Suite or Microsoft Office 2011), these will not run on Catalina 10.15.7.