How To Install Dmg File

 

DMG files are containers for apps in macOS. You open them, drag the app to your Applications folder, and then eject them, saving you the hassle of the dreaded “Install Wizard” of most Windows apps. So if all they are is a folder for an app, why do we use them instead of just downloading the app itself? The main reason macOS uses DMG files is to make sure the file downloaded properly and wasn’t tampered with.

DMG files include something called a checksum, which basically verifies that the file is 100% intact.

This is what you see when the file is opening:. This little window first goes through a phase of verifying the file, and then once it’s sure the file is good, moves on to decompressing it.

Part 3. How Does DMG File Work?

And that’s second reason why macOS uses DMG files: they’re a compressed format (like a ZIP file) that makes your download smaller.

Saving your data usage on downloads is always a good thing. RELATED:Benchmarked: What's the Best File Compression Format? Well, luckily macOS does an excellent job of making everything easy.

All you really need to do is double-click the DMG file to open it and mount it to your Mac. The DMG mounts in two places: on your desktop and in the Finder sidebar under your hard drive.

Clicking either one of these opens the DMG file.

When you open a DMG file, you’ll usually see two things: the app and a link to your applications folder.

Some DMGs—like the Steam DMG shown above—have styled backgrounds, but this is only cosmetic.

To install the app, drag it into your Applications folder. It may take a second to copy over, but when it’s done, you can launch the app from Launchpad or Spotlight like you would any other app.

Note: Do not launch the app right from the DMG. The app will no longer be there after you eject the DMG. When you’re done installing the app, you’ll be left with two copies of it, one in DMG form, and one in your Applications folder.

The DMG one can go since you don’t need it anymore.