(After installation, be sure to return this setting to its default state.) Open System Preferences, click Security and Privacy, display the General tab, and then click Anywhere under Allow applications downloaded from.Control + Click the installer icon and choose Open.However, there are two ways to install QuarkXPress 9.3 (or earlier) under Mountain Lion: As QuarkXPress 9.3 was released before Apple introduced this new feature, Gatekeeper (at its default settings) does not allow the installer for QuarkXPress 9.3 (or earlier) to launch. Gatekeeper allows only software from trusted sources to be installed: Applications from the Mac App Store, and applications from registered software vendors who have built their installers with a Gatekeeper signature. With the release of OS X 10.8 (Mountain Lion), Apple introduced a new security feature called Gatekeeper, which helps you to keep your computer free of malicious software. Is QuarkXPress 9 compatible with Mac OS X 10.8 (Mountain Lion)?
