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If you are looking to download older operating systems as .dmg files, you can use official links to create bootable USB drives: OS X El Capitan 10.11 OS X Yosemite 10.10

If you get a "damaged" error, try to download the file again, or try a different browser like Firefox to ensure the download wasn't corrupted.

are also available through archive.org. Troubleshooting

For massive text files that need to be opened on a Mac after installation, or TextMate are recommended for managing large data.

A window will appear. Often, you simply drag the application icon into the Applications folder shortcut within that window.

Downloading and installing a Mac DMG file involves acquiring a disk image ( .dmg ), mounting it, and copying the application to your computer. How to Download and Install a DMG File