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Aug 18, 2020 Download: Mac OS Sierra 10.12 ISO and DMG Image Mac OS High Sierra 10.13 ISO or DMG Download only the stub installer means web installer is the main reason that only users may be downloading from the app store. Downloaded Office for Mac but.dmg File will not execute I have purchased and down loaded the Office suite for Mac. The file that downloaded is now on my desktop as X17-45975.dmg When I go to open the file, I get a pop-up window that says The following disk image couldnt be opened; Reason is listed as 'not recognized' Is there a solution to. Method 1: Repairing Corrupt DMG File. Atheros ethernet driver windows 7. In most cases, the issue can be the corrupt or dmg file which is not downloaded correctly. So what you can do is to download the same dmg file again to make sure there is no problem with the download. Also, try downloading the file again with the download assistant plug-ins being off.

Customers get Software upgrades for Mac computers through the online app store ever since the release of macOS Lion. Be it a clean install or upgrade, Mac App store require you connect to the internet to download whole installation files. The online OS update is OK if you have stable broadband connectivity and enough bandwidth. Apple also provides an option for internet recovery of macOS if your computer fails to boot. But there are situations where you can’t download the OS from the Apple servers. Having a macOS offline installer or a bootable USB disk is the only solution in such scenarios.

Download macOS offline Installer

Installing macOS without internet requires a bootable USB disk. And you need to download a full-size macOS installer for making this disk. Hence, before anything, we will tell you how to download macOS offline installer directly from Apple to your Mac using a GitHub script.

Download the gibMacOS script from this link and extract it to your Mac. From the extracted folder, run the script called gibMacOS.command — it will open the Terminal as shown below.

Wait for the script to fetch the macOS download catalogue from Apple. When the list is ready choose a number as per your OS option and press the Return/Enter key. You can use this script to download macOS Big Sur (11.1), Catalina (10.15), Mojave (10.14), and High Sierra (10.13.6). A new folder “macOS downloads” appears in the “gibMacOS-master” as you provide a download option, and the OS starts downloading as you can see in the video.

The OS gets downloaded as parts, PKGs, DMGs and other files. For macOS versions up-to Big Sur, you need to use another script “BuildmacOSInstallApp.command” in the main folder to join all the downloads and make the full macOS installer app. All you need is to drag and drop the downloaded macOS folder to the terminal window. The script will build the offline installer and save it to the same folder.

You don’t need to use the second script if your choice is macOS Big Sur. Because, for macOS Big Sur you get a full-size installer from Apple in PKG format. Double-click and open the InstallAssistant.PKG to save the “Install macOS Big Sur.app” to the Applications folder.

Apart from this, some older versions of macOS are available for direct download from Apple (Sierra, EL Capitan, Yosemite) in DMG format.

How to make a macOS bootable USB installer

It is possible to create a backup macOS installer on a DVD or USB drive but later is the best choice. Most of the Macs these days don’t have DVD slots, and the installation through a disc is very slow. Hence we discuss only about making macOS recovery installer on a USB disc. For this you need a Mac and a USB pen drive of at least 8 GB space, and a third-party app called DiskMaker.

  1. First, download a copy of Disk Maker from the official website.
  2. Choose a version as per your requirement. For example, if you want make USB installer for macOS Catalina 10.15, download Disk Maker X 9.
  3. I use an MacBook Pro with High Sierra. Hence, I’m downloading disk maker X 7.
  4. The next step is to download full macOS installer from the App Store to your Applications folder.
  5. Run Disk Maker DMG installer and copy the app to the Applications.
  6. The application will automatically detect the downloaded macOS as shown in the screenshot. Select “Use this Copy” if you would like to proceed with it.
  7. Next is setting the USB pen drive for creating the bootable installer. Choose the third option ” An 8 GB USB Thumb drive.”
  8. The app will list all drives in your system. Pick the one you would like use as macOS USB installer.
  9. Ignore the warning message and proceed to Erase and Create macOS USB disk. Don’t forget to provide your admin password when it prompts.
  10. Keep checking notifications tab for progress. When it completes you will find Install macOS Mojave (or High Sierra) mounted to your desktop as a USB disk.
  11. That’s your backup. Unmount and keep the USB installer to a safe place.


Unfortunately, the above app is not compatible with macOS Big Sur 11 and above. Check the instructions on Apple website, the manual method to make macOS offline USB installer.

What is the alternative if I don’t have usable Mac at the moment?

This method is applicable when you have a Mac, and the internet recovery fails. But think about a situation when your only Mac stops to boot, and you don’t have USB installer or TimeMachine backup! Downloading MacOS DMG file might save you. If you have a macOS DMG, you can create bootable USB disk from a Windows PC — use a software like TransMac for this purpose.

Clean installing or restoring a Mac offline with USB pen drive

As said earlier, you could use the macOS USB installer to do a clean install or restore it upon a boot failure. Just connect the USB disk and press the Option/Alt Key when you hear the boot sound. The Mac will then display all the startup disks available.

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Pick the USB drive starting with the label “Install macOS” and follow on-screen instructions to complete the installation. If you need, use the Disk Utility to format the drive for doing a clean install.

HomeErrorHow to Fix Errors in DMG File? Step by Step Method

DMG files are Mac OS X disk image files. When users try to access DMG files, sometimes the “DMG not verified” error message appears on their screen. This error mainly occurs due to corruption or an incomplete download. Most users don’t know how to fix errors in DMG file. Therefore, in this post, we will explain various manual solutions to fix the unconfirmed error of the Mac DMG file.

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Symptoms OF An Unidentified DMG File Error

I. The processing speed of the Mac operating system is slow
II. Mac programs suddenly stop working
III. Mac data is lost or is no longer accessible
IV. Mac OS files are damaged or damaged
V. Installed programs often hang or crash
VI. Error messages are displayed on the screen with the message “DMG error not acknowledged”.

Related Solution- How to Read DMG File on Windows

User Scenario: How to Fix Errors in DMG File
“I updated my Mac OS-based system. When I tried to access the DMG file later, I received a” DMG not recognized “error message on my computer screen. I tried many known methods to fix this error, but I could not. Please let me know the appropriate solution. “

“DMG files for Mac are corrupt and damaged due to virus attacks. These files are inaccessible. I don’t know how to fix errors in DMG file. Anyone who can help fix” DMG not detected error “did it?

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Causes of Unidentified DMG File Error Messages

There are several reasons for a Mac error. This means that the DMG has not been approved. Due to this error, users cannot open or access the DMG file. Some of these causes are:
⦁ Mac Header File Corruption: A Mac is required to access the Mac data header file on Mac. Mac data files cannot be accessed due to header file corruption.
⦁ Human error: accidental deletion of Mac files, formatting Mac files or accidentally closing programs is a common human error that can damage or damage Mac files. In this case, the problem is that the file cannot be found. Mac.
⦁ Sudden system shutdown: Sometimes a power outage causes the Mac computer to unexpectedly shut down and some Mac files may not mount and stop responding.
⦁ Virus Infestation: As for viruses, Mac OS is safer than Windows, but some bad viruses still infiltrate the system, making installed programs and applications inaccessible.
⦁ Boot sector problem: If the boot sector has a problem, your Mac cannot upload files. In this case, the system cannot open the file and the file is not accessible.
⦁ Incorrect installation of programs: If you install unwanted applications and programs without checking the origin and the contract, an undetected DMG error is displayed.
⦁ Hardware and software problems: a common problem that causes errors when confirming DMG Mac files.
⦁ Aborting Read / Write Process: Aborting a read/write process in the medium can also Cause of Unidentified DMG File Error.
⦁ Changing the BIOS Settings: Changes to the BIOS sector can prevent the DMG file from recognizing the problem.
⦁ Kernel panic issue: the kernel is an important part of Mac OS, but kernel corruption prevents users from opening Mac DMG files or starting applications.

Cautions to Avoid Situations where DMG is Not Recognized

There are various precautions and tips to prevent DMG files from recognizing the problem. Some of these are shown below.
⦁ If you have problems with Unidentified DMG File Error, immediately stop using your Mac system and use the integrated disk recovery option.
⦁ Do not overwrite the free space created after deleting Mac files.
⦁ Always back up properly saved Mac files to resolve the undetected DMG problem.
⦁ Keep your Mac system up to date with virus protection updates
⦁ Avoid downloading software from suspicious or unreliable websites. Downloading software from suspicious websites can damage your system and cause unauthorized DMG errors.
⦁ Do not restart the Mac system
⦁ Do not turn off your Mac to avoid DMG confirmation errors.
⦁ Avoid updating system files
⦁ Do not share new data after the corruption problem
Always shut down the system properly
⦁ Find Trash files for Mac
⦁ After performing the above steps, the undetected DMG error will be resolved.

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Manual Way to Resolve Errors Not Recognized By DMG File

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Solution 1: This method may not resolve unrecognized DMG errors. Then follow these steps to clear the error that the DMG file is not recognized.
⦁ Find and start Disk Utility
⦁ Click the Check file system option
⦁ Wait for the scanning process to finish
⦁ Select the file to mount.

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Solution 2: If you are having trouble with your Mac system, follow these steps to fix the unrecognized DMG error:
⦁ Insert a Mac CD or bootable flash drive and reboot the system
⦁ Click the “Install Mac OS X” option
⦁ Hold down the “C” button on the keyboard
⦁ Accept the license agreement and select the desired language.
⦁ Click Macintosh HD
⦁ After that, select the installation method by clicking on the options icon. Also, if you want to save your personal file folders, user accounts, and network accounts, click Archive and Install and select Keep user and network settings.
⦁ Restart the Mac machine and respond to the setup prompts to resolve unidentified DMG errors.
⦁ Then after performing all the above steps, the DMG file recognition error will be resolved.

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Final Words

To install the application on a Mac system, a DMG file is required. If the DMG is not confirmed, the user cannot install the program on a Mac computer. After downloading a DMG file, trying to access the file may display a “DMG not confirmed” error. There are various reasons for this error, for example, for example, accidental deletion of Mac files, formatting of Mac files, corruption of Mac header files, virus attacks, boot sector issues, etc. Manually, How to Fix Errors in DMG File can be corrected by using the running disk utility and reinstalling Mac OS X.