Apple does not provide official ISO downloads. If you need an ISO for VirtualBox or VMware, you must convert the official installer app into an ISO image using the Mac Terminal. Step-by-Step Terminal Method
What is your for the image file? (Reinstalling on an old Mac, or setting up a virtual machine like VirtualBox/VMware)
: If your Mac is running 10.15 or later, you can use the softwareupdate tool to fetch the full installer directly:
If you want to move forward with setting up your installer, tell me:
Never trust a pre-made ISO. Follow this guide, use Apple’s official servers, and create your own pristine disk image in under 30 minutes. download macos catalina 10.15 iso and dmg image
Released in October 2019, represents a significant milestone in Apple's desktop operating system history. It was the first version to drop support for 32-bit applications entirely, pushing users toward a purely 64-bit environment. It also introduced Sidecar (using an iPad as a second screen) and split iTunes into three separate apps: Music, Podcasts, and TV.
Because Apple primarily distributes operating systems through the Mac App Store as an application package ( .app ), obtaining standard .iso or .dmg image files requires converting the official installer or utilizing verified mirrors. 📥 Direct Download Links for macOS Catalina 10.15.7
If you have the "Install macOS Catalina.app" in your Applications folder, you can use the Terminal to convert it into a clean ISO for virtualization. and run these commands one by one:
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/YourUSBName Use code with caution. Apple does not provide official ISO downloads
Go to the virtual machine's . Click on the empty optical drive icon and select your downloaded macOS Catalina ISO file.
Click "Get." This will open your System Preferences/Software Update tool.
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Use code with caution.
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 Use code with caution. (Reinstalling on an old Mac, or setting up
The complete guide below explains how to safely for clean installations, virtual machines, and recovery.
A: A complete macOS Catalina installer is usually between 8 GB and 9 GB. For example, a DMG file for macOS Catalina 10.15.7 (19H2) is reported to be approximately 7.71 GB.
Open and execute these commands sequentially to build the ISO: Create a blank disk image wrapper: