Whether you're troubleshooting, selling your Mac, or just want that "new Mac" feel, a clean installation of macOS 10.15 Catalina is still a great choice—especially for older Macs that don't support Big Sur or later.
The way to get macOS Catalina for a clean install is: Whether you're troubleshooting, selling your Mac, or just
A step-by-step feature/article describing how to obtain an official macOS 10.15 Catalina DMG for a clean install, why someone might need it, precautions, and a quick clean-install checklist. Use these official methods to get the installer:
Since Catalina is an older version, it won't appear in standard App Store searches. Use these official methods to get the installer: App Store Direct Link : Open the macOS Catalina download page Download the Full macOS Catalina Installer
softwareupdate --list-full-installers
To perform a clean installation, you should first download the installer app and then use it to create your own bootable media. How to Get the Full Installer macOS Catalina - App Store
To perform a clean installation of macOS 10.15 Catalina, you typically need to download the full installer and then create a bootable USB drive. 1. Download the Full macOS Catalina Installer