sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
When Apple released 10.15.7 in September 2020, it wasn't a flashy feature drop; it was a stabilization patch.
If you want to install Catalina on multiple Macs or do a clean install: download catalina 10.15.7
The primary reason users flock to Catalina 10.15.7 isn't because it is new, but because of what it allows them to keep.
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 sudo /Applications/Install\ macOS\ Catalina
If you are downloading it, do it soon. As Apple continues to update macOS, the certificates for older installers can occasionally lapse, causing verification errors. But for now, the doors to 10.15.7 remain open for those who need them.
import Foundation
If you need to do a clean install or downgrade, once the installer is downloaded, plug in your USB drive (named "MyVolume") and use the following terminal command:
This downloads the installer directly from Apple’s servers. As Apple continues to update macOS, the certificates
Apple maintains a hidden page with direct App Store links for older macOS versions.
If you are currently running macOS Big Sur or later, you cannot simply open the installer and click "Update." You must create a bootable USB installer using a command in Terminal (at least a 16GB USB drive is required).