Once the installer is sitting in your Applications folder, the goal shifts from downloading to deploying. Since you cannot simply "run" an installer to perform a clean wipe, you must create a bootable USB drive. This requires a flash drive with at least 16GB of space. Using the Terminal utility and the createinstallmedia command, you can transform that USB stick into a key that unlocks the installation environment. This step is the bridge between having the software and being able to install it on a blank hard drive.
: To reinstall without a DMG file, restart your Mac and hold Command (⌘) + R to enter Recovery Mode, then select Reinstall macOS . Once the installer is sitting in your Applications
Are you looking to perform a clean installation of macOS 10.15 Catalina on your Mac? Perhaps you're experiencing issues with your current operating system or want to start fresh with a new installation. Whatever the reason, you'll need to download the macOS 10.15 Catalina DMG file. In this article, we'll guide you through the process. Are you looking to perform a clean installation of macOS 10
"Step-by-step guide: safely download the official macOS 10.15 Catalina installer, create a bootable DMG for clean installs, verify integrity, and perform a full clean installation." In this article
Run the .pkg file inside to install the "Install macOS Catalina.app" into your /Applications folder.