A user account that does not have administrator privileges may request mounting of a disk image prior to installing a new application. An agent, registered with operating system, receives notification and determines whether or not to allow mounting of the disk image. If so, the agent causes the disk image to be mounted by the operating system. The agent examines the mounted disk image to detect an application bundle. The agent determines whether or not to proceed with installation of the application bundle and, if so, then causes the application bundle to be copied to a privileged system location, thereby installing the application on the computer device.