The installer will download directly into your folder. How to Create a Bootable USB from the DMG/Installer
The safest way to get the installer is directly from Apple. However, Catalina no longer shows up in basic App Store searches on newer Macs. Download macOS Catalina via Mac App Store hot download macos catalina 10157 dmg
Open Terminal and paste the following: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina The installer will download directly into your folder
Once you click "Get," the System Settings or Software Update pane will open to download the "Install macOS Catalina.app" file to your folder. 2. Terminal Download (For Advanced Users) Download macOS Catalina via Mac App Store Open
Type the following command and hit Enter: softwareupdate --fetch-full-installer --full-installer-version 10.15.7
If you are downloading a DMG from a third-party site because you are on a Windows PC (for a Hackintosh or VM), always verify the SHA-1 hash of the file to ensure it hasn't been tampered with.
Whether you’re reviving an older Mac, setting up a virtual machine, or need a bootable installer for troubleshooting, having the file is essential. Catalina (version 10.15) was a landmark release for Apple, famously being the first version to drop 32-bit app support and replace iTunes with dedicated Music, TV, and Podcasts apps.