1. Open the downloaded qxp2015_mac.dmg file.
Note:- DO NOT double click on QuarkXPress 2015 icon in the below screen.
3. Now, you can either drag the QuarkXPress 2015 into the Mac HDD//Applications
4. Once you move QuarkXPress 2015 into the Applications folder, launch it to execute Setup Assistant.
5. Follow the onscreen setup assistant instructions to complete the installation.