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Keithyes's avatar
Keithyes
Copper Contributor
Mar 08, 2026

macOS Catalina dmg file download for old macbook pro

Got a refurbished macbook pro late 2015. The best maos version for this old macbook pro is Catalina. I need to download the dmg file to make a bootable drive for reinstalling Catalina on my mac. I t...
Yahyayo's avatar
Yahyayo
Iron Contributor
Mar 08, 2026

You can use the Official Terminal Command to get a macOS Catalina download DMG. This is the most straightforward and official method if you are on another Mac or currently have a functioning macOS system. The softwareupdate command can fetch the full installer for Catalina directly from Apple.

1. Open Terminal: You can find it in Applications > Utilities.

2. Run the Command: Type or paste the following command and press Enter:

bash

softwareupdate --fetch-full-installer --full-installer-version 10.15

This command tells your Mac to download the full macOS Catalina (version 10.15) installer from Apple's servers.

3. Wait for the Download: The download will take some time as the installer is several gigabytes. You can monitor the progress in the Terminal window.

4. Locate the Installer: Once complete, the installer named Install macOS Catalina.app will be in your Applications folder. You can then use this .app file to create your bootable drive.

 

You might find websites offering direct macOS Catalina download DMG. While these can be tempting, especially from a Windows PC, they come with security risks. Files from unofficial sources could be tampered with. If you must use this route, only download from reputable sources like the Internet Archive and be extremely cautious.