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When you download an app or a piece of software on your Mac, the file is usually downloaded as a DMG file. DMG files serve as containers for apps in macOS. You just need to double-click the downloaded DMG file, drag the app to the Applications folder, then unmount the installer. This way, the installation process has been simplified and users don’t have to suffer the hassle of installation wizards that are plaguing Windows users.
Install For All Users Of This Computer Greyed Out Mac Address. As you can see, if you have a computer available updating via iTunes is an option. Thank you for using Apple Support Communities. Install For All Users Of This Computer Greyed Out Mac Download Have a great day! Reinstalling the OS from the internet ends with the drives greyed-out saying the drive is locked. I can boot the machine via the external HD clone of the 2009 but just not the internal drives. I made an installation USB and run into the same greyed out internal drives. If I can just figure out how to unlock the drives to install the OS. Re: Grant Easy Access Greyed Out - Unable to select I also had this problem on Ubuntu. I haven't directly solved it but it seems if you sign into Teamviewer in your browser and manually add a computer (using the ID on your PC in question) it seems to do the job.
If you choose a user, then whenever the Mac starts up, that user is automatically logged in. If you choose Off, then at startup the Mac opens a login window showing all the users. Automatic login takes effect the next time you restart the Mac. When running the Install Microsoft Office 2016 for Mac installer, the option to 'Install for me only ' is grayed out leaving only 'Install for all uses of this computer 'and 'Install on a specific disk.' As the active options. I want to install for me only and preserve the other user account on my Mac as is without the Office 2016.
Although the installation process sounds simple, it is much more complicated than that. The contents of the DMG goes through a checksum process to verify that the file is 100% intact and that it hasn’t been tampered with. Once the file has been verified, it is then decompressed. DMG files are designed for macOS and you can’t run them on Windows devices.
DMG files make app installations on macOS a lot quicker and easier. However, there have been several reports from users about the .dmg file not opening on Mac. There are different versions to this error, but the end scenario is the same: for some reason, users are unable to open the .dmg file on Mac. This guide will discuss why some users have trouble opening a DMG file and how to resolve this issue.
Unable to Open .DMG File on Mac
Installing a DMG file on Mac should be as easy as double-clicking the file and dragging the app to the Applications folder. However, the process is not as smooth for some Mac users because they are not able to open the DMG file to start with. According to user reports, the download process was completed and there were no issues with unzipping. But when it comes to opening the unzipped files, nothing happens. Some users who encounter this issue get the resource temporarily unavailable error while others noted no activity happening no matter how many times the file is clicked.
Others encounter this error message when opening the DMG file:
There is no default application specified to open the document.
When the user tries to open it, either the options are grayed out or nothing happens when any of the options are clicked. This error has caused the affected Mac users to be frustrated. The users who encountered this error tried to redownload the file using a different Mac and the DMG file seems to be working fine, which means that the problem lies with the device itself. But what causes DMG files to not open on Mac?
Why Your .DMG File Is Not Opening on Mac
Some users noted that they cannot open the .dmg file on Mac after updating to Catalina, but there are also those who encountered this error when running an older version of macOS. This means that the problem is not unique to Catalina but it is something that affects the entire macOS system.
Here are some of the possible reasons why some users are having trouble opening DMG files:
- If your Mac is running Catalina, check the version of the app you are trying to open. Catalina no longer supports 32-bit apps. So if you’re trying to download and install a 32-bit app, then you might not be able to install it on Catalina.
- If you have poor or unstable internet connection, it is possible that the file was not downloaded completely, resulting in errors when accessing the file.
- If you downloaded the file from an untrustworthy source, it might be a fake DMG file or it could be loaded with malware.
- It is also likely that the DMG file you downloaded is corrupted. An interrupted download process and malware infection are the two leading causes of file corruption.
Hence, before you start the troubleshooting process, here are some things you need to consider:
- Download the file once again using a different internet connection. Try using a wired connection if possible.
- Scan the file for malware infection, especially if the file was downloaded from an untrustworthy source.
- Download the file from another source. If the app is not available on the Mac App Store, visit the developer’s website and download the installer from there instead.
- If you’re running macOS Catalina, make sure that you are downloading the 64-bit version of the app.
How to Open .DMG File on Mac
If you’re having trouble opening the DMG file on Mac, here are some of the things you can do:
Method #1. Use DiskImageMounter.
- After downloading the DMG file, right-click or Command + click on the file.
- Choose Open With from the menu, then select DiskImageMounter.
- Depending on the size of your file, you should see the mounted Disk Image appear on your Desktop.
- If you don’t see the Disk Image, choose Other from the right-click menu.
- Navigate to /System/Library/CoreServices/DiskImageMounter.app
- The DMG file should now be mounted.
Method #2. Mount the .DMG File via Terminal
If the right-click menu is grayed out or nothing happens when you click any of the Open With options, you can try mounting the file using Terminal instead. Drag the file to the Desktop and follow the steps below:
- Open the Terminal app by going to Finder > Applications > Utilities.
- In the Terminal window, type in the following command and press Enter: cd ~/Desktop
- Next, type in this command, then press Enter: hdiutil attach filename.dmg
- Replace filename.dmg with the actual .dmg file name.
- After executing the two command lines, your .dmg file will now be mounted on your Mac.
Method #3: Use a Third-Party Tool.
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If you cannot open the DMG file using the two methods above, you can try using a third-party utility instead. Here are some of the apps you can try:
Summary
Installing applications on macOS is a lot simpler compared to installing programs on Windows, thanks to the DMG file. However, it is normal to run into errors when opening a DMG file, especially if the file has been corrupted or has not been completely downloaded on your device. If this is the case, you can try any of the three methods listed above to open the problematic DMG file.
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The Mac folders or files grey out and show 24 January 1984 error can be caused by many possible reasons. And you may fix the problem by changing the date of greyed out folders in Mac Terminal. If the issue can’t be settled, you can use EaseUS Data Recovery Wizard for Mac Free to recover data on Mac without effort.
When folders or files showed greyed out on Mac, you cannot open it nor access the saved file. To resolve this issue, you may need to use Terminal on Mac for help. Follow the two phrases provided on this page, you will effectively fix folders and files greyed out issue on Mac with ease:
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Workable Solutions | Step-by-step Troubleshooting |
---|---|
Phrase 1. Fix Greyed Out Folder/Files | Open Finder > Locate the greyed out folder or file > Go to Application > Open Terminal...Full steps |
Phrase 2. Recover Folders/Files | To restore the lost folders and files, run EaseUS Mac data recovery software, scan device...Full steps |
Why my folders and files greyed out on Mac?
'I managed to transfer some photos and videos from an old Seagate external hard drive to my Mac, but they all grayed out and couldn't be accessed! By the way, the grayed out folders and files reported an error 24 January 1984. Did it mean those files were created on that date? That's ridiculous. How could I fix grayed out folders or files on Mac without data loss and damage?'
When Mac folders or files greyed out and were inaccessible, your Mac could detect the error and set the date the Macintosh was first introduced, January 24, 1984. Many factors can cause this problem, like a fault in the file system entry for the file, or Mac hard drive formatting, interruption in the file or folder copying process, power failure, Mac OS crash, and more. Whatever the reason is, the result is the files or folders greyed out; you cannot open the folder.
How to Fix Mac Folders Grayed out in Terminal
Changing the date of the folder or file is a feasible way to fix greyed out folder on Mac. You can make it with the help of XCode (download XCode from the App Store).
Step 1. Open Finder and find the grayed out folder or file that shows 24 January 1984 error.
Step 2. Go to Applications and open the Terminal app.
Step 3. Type SetFile -d 11/09/2016 /Path/to/grayed-out-folder/ and tap on return.
By running the command, the date of your grayed out files or folders will change to 11/09/2016. Or you can set the time to any day as you wish. Now, you should see the greyed out folder turns to normal black.
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A similar topic you may be interested in: How to fix photos half grayed out.
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How to Recover Folders/Files with Free Mac Data Recovery Tool
Congratulations if you have solved the grayed out folders issue by following the instructions listed above. While if the problem keeps unsettled and is related to Mac hard drive formatting, operation errors, or system failure, you’d better directly recover the greyed out folders or files by using free data recovery software for Mac.
EaseUS Data Recovery Wizard for Mac is such a free tool that allows you to recover lost or deleted files, photos, audio, music, emails from Mac hard drive effectively and safely. It supports data recovery from Mac trash bin, hard drive, memory card, flash drive, digital camera and camcorders due to deletion, formatting, lost partition, virus attack, system crash, and more.
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Step 1. Select the disk location (it can be an internal HDD/SSD or a removable storage device) where you lost data and files. Click the 'Scan' button.
Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.
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Step 3. In the scan results, select the file(s) and click the 'Recover Now' button to have them back.