Before downloading the DMG, ensure your hardware is compatible. Generally, the following models support Catalina: 2015 and later MacBook Air/Pro: 2012 and later iMac: Late 2012 and later Mac mini: Late 2012 and later Mac Pro: Late 2013 and later How to Download the macOS 10.15.7 DMG
Open Finder, locate your USB drive, and rename it to exactly MyVolume (this makes the Terminal command work seamlessly).
As of April 2026, macOS Catalina 10.15.7 remains a vital operating system for users of "Vintage" Mac hardware. Whether you are performing a clean install to revive an older MacBook or setting up a virtual machine, obtaining a safe and official is essential.
Never download a macOS installer from a domain that does not end exactly in .apple.com . Third-party file-sharing sites often bundle malware, adware, or spyware into operating system images. How to Create a Raw DMG File from the Installer App
Open your web browser and navigate to the official page. Search for macOS Catalina 10.15.7 .
: Recommended if you are upgrading from 10.15.0 through 10.15.6.
hdiutil create -o ~/Desktop/Catalina.dmg -size 8900m -volname Catalina -fs HFS+J Use code with caution.
These official downloads are distributed as PKG files rather than DMG files, but they accomplish the same goal of updating your existing macOS Catalina installation to version 10.15.7.
Fixes an issue that could prevent files syncing through iCloud Drive.
The panel in your System Preferences will open automatically. Click Download to begin fetching the installer.
Official Apple downloads typically arrive as an .app installer in your folder rather than a .dmg . To create a DMG from the installer for bootable media or virtualization:
