Without the full installer, you cannot perform any of these advanced tasks.
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 download macos catalina 10.15.7 full installer
Run installer, then reset date.
For tech-savvy users, Greg Neagle’s open-source python script gives access to every macOS version ever released by Apple. Without the full installer, you cannot perform any
shasum /Applications/Install\ macOS\ Catalina.app/Contents/SharedSupport/InstallESD.dmg
Even if you don't need the patcher (your Mac is supported), the download function is identical to Apple's official source. Without the full installer
If your Mac is older than 2012, you cannot run Catalina. If your Mac is from 2019 or newer, you should consider macOS Big Sur or later.
