: The App Store method works reliably on macOS Mojave and earlier. However, Apple has removed older macOS versions from general availability in the App Store for newer operating systems. If you cannot find Catalina in the App Store, proceed to Method 2 or Method 3.
Press and hold down the key on your keyboard while pressing the Power button to boot up the Mac.
Getting a macOS 10.15 Catalina installer can be tricky because Apple often pushes users toward the newest version. While Apple does not provide a direct standalone .dmg file for Catalina like they do for much older versions, you can still download the official installer through the App Store or Terminal and then create your own DMG if needed. 1. Download via the App Store (Easiest) This is the standard way to get the full installer. Open the macOS Catalina App Store page in Safari.
Keep holding the Option key until you see the Startup Manager screen displaying available boot drives. Download Macos 10.15 Catalina Dmg File
Apple hides older OS versions from standard App Store searches. You must use a direct link to open the hidden page.
: A Python-based tool available on GitHub that downloads macOS installer files directly from Apple's servers. It can help you obtain the base files needed to create a DMG.
If you downloaded the official InstallAssistant.pkg from Apple's servers, you must first convert it into a standard .dmg format to use it with virtual machines (like VMware or VirtualBox) or windows-based flashing tools. : The App Store method works reliably on
: These third-party utilities simplify the process by providing direct download options for various macOS versions, including Catalina, and offer built-in features to create bootable USB drives. System Requirements for macOS Catalina
Your Mac must be running OS X Mavericks (10.9) or later to upgrade to Catalina via the official App Store method.
A: Not easily. Apple hides direct DMG links. Use the softwareupdate method above – it’s safe and official. Press and hold down the key on your
Once you've downloaded the installer, you can create a DMG file using the following steps:
Before downloading and installing MacOS 10.15 Catalina, ensure your Mac meets the system requirements: