A window will appear. Often, you simply drag the application icon into the Applications folder shortcut within that window.
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 Download MAC dmg
Double-click the downloaded .dmg file to "mount" it. It will act like a virtual drive on your desktop or in your Finder sidebar. A window will appear
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 It will act like a virtual drive on
Click the download link from your browser. Safari typically saves these to the Downloads folder, which you can access via the Dock or Finder.