DMG is used for disk image files on Macintosh computers running Mac OS X. This file extension replaces the older file extension IMG which was discontinued during the release of. A file with the DMG file extension is an Apple Disk Image file, or sometimes called a Mac OS X Disk Image file, which is basically a digital reconstruction of a physical disc. For this reason, a DMG is often the file format used to store compressed software installers instead of having to use a physical disc.

Mac OS X Apps which are not present on Mac AppStore are generally distributed in either .pkg or .dmg formats. However, many users find it difficult to install them due to their unfamiliarity with the .dmg format. Here’s a simple tutorial which will guide you on How you can easily install apps packaged in .dmg format on your Mac OS X machine (iMac & Macbook) . This method works on all Mac OS X versions (Mountain Lion, Mavericks, Yosemite & El Capitano as well) . Read on more for the complete tutorial.

Method to Install .dmg Format Apps on Mac OS X –

Pre-Requisites –

The .dmg File of the App you want to install. Download & Save the .dmg file in any folder.
Non-Guest User account access in Mac OS X (Any User account with app-install permissions or Administrator account).
In our Example, We will be using the Opera browser .dmg file to demonstrate the installation process.

Steps to Install .dmg Apps in Mac OS X –

Navigate to your .dmg file in Finder and double-Click on it.
Now, Depending upon the source from where the app was obtained, OS X may start the installation process or it might block the installation of App with the error “unidentified developer” . Click here for solution to “unidentified error” for your .dmg app .
If you didn’t get the error, You will see an installer / or the app will install its image onto your homescreen (.dmg are basically app image files).
Now, you’ll see the App Image (with a disc type icon) on to your Homescreen on Mac as show below –
App After its Dmg File installed
Installing the Dmg file doesn’t mean its installed, You will need to drag the App Icon image to the “Applications” folder for it to function properly.
Dragging App Icon to Applications Folder – Launch the App by double clicking the App Image icon. It will open a window as shown in the image below-
Drag App Icon on to the Applications Folder
Now Click and drag the App Icon on to the “Applications” folder. i.e from Position 1. to Position 2. in the above image.
Once you drag the Application App Image icon on to the Applications folder, it will be installed & will now be visible inside the Applications folder as shown below –
If you see the your App Icon without disk image background , You have installed the .dmg app successfully! .
Simply Double-click the App Icon inside the Applications folder to launch your Application program.

So, this is one of the most simple methods to install .dmg application programs on Mac OS X. Some apps may require a further tweaking but this will get the job done 99 times. If you face any issues or encounter any problems feel free to comment.

Are you trying to make a bootable installer? Do you have the El Capitan installer downloaded from the App Store? You cannot make a bootable DVD but you can make a bootable flash drive.

Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra

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First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer. Simply replace the Terminal command with the one from the preceding article by copying it into the Terminal window. You will need an 8GB or larger USB flash drive that has been partitioned and formatted for use with OS X.

Drive Partition and Format

Open Disk Utility in the Utilities' folder.
After Disk Utility loads select the drive (out-dented entry with the mfg.'s ID and size) from the side list.
Click on the Erase tab in the Disk Utility toolbar. Name the drive, 'MyVolume'. <---- IMPORTANT!
In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
Click on the Apply button and wait for the Done button to activate. When it does click on it.
Quit Disk Utility.

Create Installer

Open the Terminal in the Utilities' folder. Choose the appropriate command line (in red) depending upon what OS X installer you want. Paste that entire command line from below at the Terminal's prompt:

Command for macOS High Sierra:

sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS High Sierra.app

Command for macOS Sierra:

sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS Sierra.app

Command for El Capitan:

sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El Capitan.app

Command for Yosemite:

sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Yosemite.app

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Command for Mavericks:

sudo /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Mavericks.app

Press RETURN. You will be asked for your admin password. It will not echo to the Terminal window. Then press RETURN again. Wait for the return of the Terminal prompt signifying the process has completed. It takes quite some time to finish. Be patient.

Mar 3, 2018 7:47 PM