softwareupdate --fetch-full-installer --full-installer-version 10.15.7
To acquire a legitimate macOS Catalina ISO image for use in virtual machines (like VirtualBox or VMware), you must first download the official installer application on a Mac and then manually convert it into an ISO image. 🚀 Step 1: Download the Official macOS Catalina Installer Macos Catalina Iso Image - Download
Apple only distributes the macOS Catalina installer through the Mac App Store or via Terminal as an application or DMG file. Macos Catalina Iso Image - Download
mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso Macos Catalina Iso Image - Download
"The application Install macOS Catalina cannot be used from this disk image." Solution: You are trying to run the installer from the ISO itself. Instead, you must boot from the ISO (restart your computer and hold Option/Opt/ESC to select the ISO as a boot drive).