Here's a step-by-step guide to create a bootable installer for macOS Catalina 10.15.7, which includes the DMG file:
Before we dive into the solution, let's quickly discuss why you might want a better approach:
file for a virtual machine or a bootable drive and only have the "Install macOS Catalina" app, you can create one using Download the installer from the App Store as mentioned in Step 1. Open Terminal (Applications > Utilities). createinstallmedia
If you already have Catalina and just need the 10.15.7 patch, download the macOS Catalina 10.15.7 Combo Update (4.82 GB). Standard Update (10.15.7): For upgrading from 10.15.6, use the macOS Catalina 10.15.7 Update (2.86 GB). Apple Support Method 2: Use Terminal (Fastest for Mac Users)
Halfway through, the screen went black. Her heart stopped. Then the Apple logo reappeared, smaller, as if the machine itself was catching its breath. A loading bar. Then, impossibly, the setup assistant: “Welcome to macOS Catalina.”