Your Mac is too new (e.g., M1 MacBook Pro 2021). Apple blocks Catalina downloads on hardware that never supported it.
A bootable USB drive helps you repair broken operating systems or perform a clean installation. Prerequisites A USB flash drive with at least of storage.
provides a user-friendly alternative:
If you are operating an older Mac compatible with Catalina, you can pull the application image straight from Apple's native delivery network.
Open Disk Utility , select your drive, and erase it using Mac OS Extended (Journaled) format and GUID Partition Map . Name it CatalinaUSB . Download Macos Catalina 10.15.7 Dmg File
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Use code with caution. Detach the mounted volume: hdiutil detach /Volumes/Install\ macOS\ Catalina Use code with caution. Move the finalized DMG file to your desktop: mv /tmp/Catalina.dmg ~/Desktop/ Use code with caution. Creating a Bootable USB Drive from the Installer
You can safely download the official directly from the Mac App Store, or get the macOS Catalina 10.15.7 Combo Update directly from Apple Support. A DMG (Disk Image) file is the most versatile format for reinstalling your operating system, building a bootable USB installer, or configuring a virtual machine. Your Mac is too new (e
A primary reason for configuring a Catalina DMG file is creating a bootable recovery drive. Requirement Specification Minimum 16 GB storage Drive Format Mac OS Extended (Journaled) Partition Map GUID Partition Map Step-by-Step USB Creation Plugin your 16 GB flash drive.