Open Terminal and run:
hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J
This creates a blank 8.5GB DMG.
Looking to run macOS Catalina 10.15 on a Virtual Machine (VMware, VirtualBox) or create a bootable installer for a Hackintosh? You need either an ISO (for cross-platform VMs) or a DMG (for macOS recovery or USB creation).
This guide provides two methods:
⚠️ Disclaimer: This content is for educational purposes. Ensure you own a legitimate Apple device or comply with Apple’s software license agreement.
Assumes the installer is in /Applications named Install macOS Catalina.app.
Result: Catalina-10.15.dmg on Desktop (read-only compressed image).
Warning: macOS installer files are licensed by Apple for use only on Apple hardware. Use these images only on Macs or in ways permitted by Apple’s license.
Download Now: macOS Catalina 10.15 ISO + DMG
Last updated: October 2025 | File integrity verified
Downloading macOS Catalina 10.15: A Step-by-Step Guide
Are you looking to download macOS Catalina 10.15 ISO and DMG images? Look no further! In this article, we'll walk you through the process of obtaining these files, discuss their uses, and provide some essential information to keep in mind.
What are macOS Catalina 10.15 ISO and DMG images?
Before we dive into the download process, let's quickly explain what these files are:
Downloading macOS Catalina 10.15 ISO and DMG images
To download macOS Catalina 10.15 ISO and DMG images, follow these steps: download macos catalina 10.15 iso and dmg image
Method 1: Download from Apple (Recommended)
Method 2: Download from third-party sources (Not Recommended)
Some websites offer direct downloads for macOS Catalina 10.15 ISO and DMG images. However, we strongly advise against using these sources, as they may:
Uses for macOS Catalina 10.15 ISO and DMG images
Having these files can be useful in various situations:
Important notes
Conclusion
Downloading macOS Catalina 10.15 ISO and DMG images can be useful in various situations. While we recommend downloading the installation files directly from Apple, be aware of the potential risks and limitations associated with third-party sources. Always follow best practices for creating bootable installers and using these files to ensure a smooth and secure installation process.
Apple does not provide official standalone full installer files for macOS Catalina. Instead, the standard method for obtaining the software is through the Mac App Store
, which downloads an "Install macOS Catalina.app" to your Applications folder. Apple Support Community
Below are the most reliable methods to obtain or create these images for installation or virtual machines. 1. Official Download (Installer App)
If you are on a compatible Mac, you can download the installer directly from Apple. This is the safest method to ensure the file is verified and secure. Apple Support Community Via App Store: macOS Catalina download page in the Mac App Store. Via Terminal:
Open Terminal and run the following command to download the full 10.15 installer:
softwareupdate --fetch-full-installer --full-installer-version 10.15 Microsoft Community Hub 2. Creating a Custom .dmg or .iso Image
Once you have the ".app" installer in your Applications folder, you can use Terminal to convert it into a bootable image for virtual machines (VirtualBox/ To create a .dmg: command to create a blank disk image of roughly 8.5 GB. createinstallmedia Open Terminal and run: hdiutil create -o /tmp/Catalina
tool inside the app to copy the installer files to that image. Microsoft Community Hub To create an .iso: After creating a , you can convert it to using this command:
hdiutil convert /path/to/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.iso 3. Direct .dmg Download (Updates Only) Apple provides direct point updates
(e.g., 10.15.7), but these are not full operating systems and require an existing version of Catalina to be installed. Apple Support Community macOS Catalina 10.15.7 Combo Update macOS Catalina 10.15.7 Update 4. Third-Party Sources (Proceed with Caution)
If you do not have access to a Mac and need an ISO for a Windows-based virtual machine, some community archives host pre-made images.
Use these only if official methods are unavailable, as they are not verified by Apple. Apple Support Community Internet Archive (macOS Catalina 10.15.7 ISO) specific Terminal commands
to turn your downloaded installer app into a bootable ISO for a virtual machine? where can i download catalina 10.15.2 dmg or iso please?
To download macOS Catalina 10.15, it is important to understand that Apple does not provide a direct "ISO" or "DMG" file for public download. Instead, you must first obtain the official installer application from the App Store and then manually convert it into the specific image format you need. 1. Official Download Methods
You can get the official macOS Catalina installer using one of the following methods on a compatible Mac:
App Store Link: Visit the Official macOS Catalina page in the Mac App Store.
Terminal Command: If your Mac is running 10.15 or later, you can use the softwareupdate tool to fetch the full installer directly:
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 Use code with caution. Copied to clipboard
Official Support Page: Apple provides a comprehensive guide for downloading older versions of macOS. 2. Creating a macOS Catalina DMG Image
Once the "Install macOS Catalina.app" is in your Applications folder, you can create a bootable DMG for backup or distribution. Open Terminal. Create a blank disk image (approx 8.9 GB):
hdiutil create -o ~/Desktop/Catalina -size 8900m -volname Catalina -layout SPUD -fs HFS+J Use code with caution. Copied to clipboard Mount the image:
hdiutil attach ~/Desktop/Catalina.dmg -noverify -mountpoint /Volumes/Catalina Use code with caution. Copied to clipboard This creates a blank 8
Use the createinstallmedia tool inside the installer app to write the installer to the mounted image:
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Use code with caution. Copied to clipboard 3. Creating a macOS Catalina ISO Image How I Create a macOS Catalina ISO for VirtualBox or VMware
Downloading the full installer for macOS Catalina 10.15 is best done through official Apple channels to ensure the image is secure and unmodified. While Apple does not provide direct links for ISO files, you can easily download the official DMG or App installer and convert it yourself. 📥 Official Download Links
To get the authentic macOS Catalina installer, use the following official source:
Mac App Store: Download macOS Catalina 10.15.7 directly to your Applications folder.
Support Page: If the App Store link fails, check the Apple Support Download page for disk image (.dmg) files of older versions. 🛠️ How to Create a Catalina ISO
If you need an ISO for a virtual machine (like VMware or VirtualBox), follow these steps in your Mac's Terminal after downloading the installer to your Applications folder:
Create a blank disk image:hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J
Mount the image:hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina
Flash the installer files:sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction
Unmount the volume:hdiutil detach /Volumes/Install\ macOS\ Catalina
Convert to ISO format:hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdrmv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso 💻 System Requirements
Before installing, ensure your hardware is compatible with Catalina: RAM: At least 4GB (8GB recommended).
Storage: Minimum 12.5GB available (up to 20GB for clean installs). Supported Models: MacBook: Early 2015 or newer. MacBook Air / Pro: Mid 2012 or newer. Mac mini / iMac: Late 2012 or newer. Mac Pro: Late 2013 or newer.
💡 Quick Tip: If you are on a Windows PC and cannot access a Mac to create the ISO, you may find community-hosted versions on the Internet Archive, though these are not officially verified by Apple. Apple macOS Catalina (10.15.7) - Internet Archive