220-1102 Question 191
Single answer.dmgA user downloads a software installer from a vendor website to a MacBook running macOS. The file is named "SecureConnect.dmg." The user says double-clicking the file opens a window showing the application icon and a shortcut to the Applications folder, but the software does not appear in Launchpad after closing the window. What should the technician instruct the user to do next to correctly complete the installation?
- A
Run the .dmg file from Terminal with administrator privileges so macOS can unpack it into /Applications automatically
- B
Drag the application icon from the mounted .dmg window into the Applications folder shortcut, then eject the disk image
- C
Rename the .dmg file to .pkg and reopen it so the macOS installer can register the application
- D
Use Disk Utility to convert the .dmg into an .iso file and then reinstall the application from the converted image
Show answer and explanation
Correct answer: B
Explanation
The key applied concept is understanding what a .dmg file is and how macOS software is often distributed. A .dmg is a disk image that, when opened, mounts like a temporary volume in Finder. Many Mac applications are installed by dragging the app bundle from the mounted image into the Applications folder. Simply opening the .dmg does not install the software. After copying the app, the user should launch it from Applications or Launchpad and eject the mounted disk image. This aligns with standard Apple macOS software distribution behavior and common vendor installation instructions for drag-and-drop apps.
- A. Incorrect.
Incorrect. A .dmg file is a macOS disk image, not a script that must be run from Terminal to install properly. While some software may require admin approval when moved into /Applications, simply using sudo in Terminal is not the normal or recommended installation method for a drag-and-drop app. This option reflects a common misconception that all installers must be executed with elevated privileges.
- B. Correct.
Correct. A .dmg commonly mounts a disk image containing the application and often a shortcut to the Applications folder. The standard installation method is to drag the app into Applications, wait for the copy to complete, and then eject the mounted disk image. This matches common macOS software distribution practices and explains why the app was not available after the user only opened and then closed the disk image window.
- C. Incorrect.
Incorrect. Changing the file extension does not convert the file format. A .pkg file is a package installer with a different structure and installation process than a .dmg disk image. Renaming the file would not make it a valid installer and could prevent macOS from opening it correctly.
- D. Incorrect.
Incorrect. Disk Utility can work with disk images, but converting a vendor-provided .dmg to .iso is unnecessary and does not help with standard macOS app installation. An .iso is commonly associated with optical disc images and is not the expected format for routine macOS drag-and-drop application deployment.