Nov 18, 2019  Versions of Mac newer than OS X 9 support DMG files, while the older Mac OS Classic uses the IMG file format for the same purpose. DMG is also an acronym for some technology terms that aren't related to the Mac disk image file format, like Direct Mode Gateway and Diversity-Multiplexing Gain.

1. Os X 10.10 Download Dmg

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So, you’ve decided to download an older version of Mac OS X. There are many reasons that could point you to this radical decision. To begin with, some of your apps may not be working properly (or simply crash) on newer operating systems. Also, you may have noticed your Mac’s performance went down right after the last update. Finally, if you want to run a parallel copy of Mac OS X on a virtual machine, you too will need a working installation file of an older Mac OS X. Further down we’ll explain where to get one and what problems you may face down the road.

A list of all Mac OS X versions

We’ll be repeatedly referring to these Apple OS versions below, so it’s good to know the basic macOS timeline.

STEP 1. Prepare your Mac for installation

Given your Mac isn’t new and is filled with data, you will probably need enough free space on your Mac. This includes not just space for the OS itself but also space for other applications and your user data. One more argument is that the free space on your disk translates into virtual memory so your apps have “fuel” to operate on. The chart below tells you how much free space is needed.

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Note, that it is recommended that you install OS on a clean drive. Next, you will need enough disk space available, for example, to create Recovery Partition. Here are some ideas to free up space on your drive:

• Uninstall large unused apps
• Empty Trash Bin and Downloads
• Locate the biggest files on your computer:

Go to Finder > All My Files > Arrange by size
Then you can move your space hoggers onto an external drive or a cloud storage.
If you aren’t comfortable with cleaning the Mac manually, there are some nice automatic “room cleaners”. Our favorite is CleanMyMac as it’s most simple to use of all. It deletes system junk, old broken apps, and the rest of hidden junk on your drive.

Download CleanMyMac for OS 10.4 - 10.8 (free version)

Download CleanMyMac for OS 10.9 (free version)

Download CleanMyMac for OS 10.10 - 10.14 (free version)

STEP 2. Get a copy of Mac OS X download

Normally, it is assumed that updating OS is a one-way road. That’s why going back to a past Apple OS version is problematic. The main challenge is to download the OS installation file itself, because your Mac may already be running a newer version. If you succeed in downloading the OS installation, your next step is to create a bootable USB or DVD and then reinstall the OS on your computer.

How to download older Mac OS X versions via the App Store

If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab. There you’ll find all the installers you can download. However, it doesn’t always work that way. The purchased section lists only those operating systems that you had downloaded in the past. But here is the path to check it:

1. Click the App Store icon.
2. Click Purchases in the top menu.
3. Scroll down to find the preferred OS X version.
4. Click Download.

This method allows you to download Mavericks and Yosemite by logging with your Apple ID — only if you previously downloaded them from the Mac App Store.

Without App Store: Download Mac OS version as Apple Developer

If you are signed with an Apple Developer account, you can get access to products that are no longer listed on the App Store. If you desperately need a lower OS X version build, consider creating a new Developer account among other options. The membership cost is $99/year and provides a bunch of perks unavailable to ordinary users.

Nevertheless, keep in mind that if you visit developer.apple.com/downloads, you can only find 10.3-10.6 OS X operating systems there. Newer versions are not available because starting Mac OS X Snow Leopard 10.7, the App Store has become the only source of updating Apple OS versions.

Purchase an older version of Mac operating system

You can purchase a boxed or email version of past Mac OS X directly from Apple. Both will cost you around $20. For the reason of being rather antiquated, Snow Leopard and earlier Apple versions can only be installed from DVD.

Buy a boxed edition of Snow Leopard 10.6
Get an email copy of Lion 10.7
Get an email copy of Mountain Lion 10.8

The email edition comes with a special download code you can use for the Mac App Store. Note, that to install the Lion or Mountain Lion, your Mac needs to be running Snow Leopard so you can install the newer OS on top of it.

How to get macOS El Capitan download

If you are wondering if you can run El Capitan on an older Mac, rejoice as it’s possible too. But before your Mac can run El Capitan it has to be updated to OS X 10.6.8. So, here are main steps you should take:

1. Install Snow Leopard from install DVD.
2. Update to 10.6.8 using Software Update.
3. Download El Capitan here.

“I can’t download an old version of Mac OS X”

If you have a newer Mac, there is no physical option to install Mac OS versions older than your current Mac model. For instance, if your MacBook was released in 2014, don’t expect it to run any OS released prior of that time, because older Apple OS versions simply do not include hardware drivers for your Mac.

But as it often happens, workarounds are possible. There is still a chance to download the installation file if you have an access to a Mac (or virtual machine) running that operating system. For example, to get an installer for Lion, you may ask a friend who has Lion-operated Mac or, once again, set up a virtual machine running Lion. Then you will need to prepare an external drive to download the installation file using OS X Utilities.

After you’ve completed the download, the installer should launch automatically, but you can click Cancel and copy the file you need. Below is the detailed instruction how to do it.

STEP 3. Install older OS X onto an external drive

The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks.

1. Start your Mac holding down Command + R.
2. Prepare a clean external drive (at least 10 GB of storage).
3. Within OS X Utilities, choose Reinstall OS X.
4. Select external drive as a source.
5. Enter your Apple ID.

Now the OS should start downloading automatically onto the external drive. After the download is complete, your Mac will prompt you to do a restart, but at this point, you should completely shut it down. Now that the installation file is “captured” onto your external drive, you can reinstall the OS, this time running the file on your Mac.

1. Boot your Mac from your standard drive.
2. Connect the external drive.
3. Go to external drive > OS X Install Data.

Locate InstallESD.dmg disk image file — this is the file you need to reinstall Lion OS X. The same steps are valid for Mountain Lion and Mavericks.

How to downgrade a Mac running later macOS versions

If your Mac runs macOS Sierra 10.12 or macOS High Sierra 10.13, it is possible to revert it to the previous system if you are not satisfied with the experience. You can do it either with Time Machine or by creating a bootable USB or external drive.
Instruction to downgrade from macOS Sierra

Instruction to downgrade from macOS High Sierra

Instruction to downgrade from macOS Mojave

Instruction to downgrade from macOS Catalina

Before you do it, the best advice is to back your Mac up so your most important files stay intact. In addition to that, it makes sense to clean up your Mac from old system junk files and application leftovers. The easiest way to do it is to run CleanMyMac X on your machine (download it for free here).

Visit your local Apple Store to download older OS X version

If none of the options to get older OS X worked, pay a visit to nearest local Apple Store. They should have image installations going back to OS Leopard and earlier. You can also ask their assistance to create a bootable USB drive with the installation file. So here you are. We hope this article has helped you to download an old version of Mac OS X. Below are a few more links you may find interesting.

These might also interest you:

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You have reached the right place if you are a Mac computer user who plans to upgrade to Yosemite DMG Download. If you are new to this operating system update you can not just run the upgrade without looking into a version. We provide the appropriate official download links to update your MacOS to Yosemite DMG. Here we’ve been here to help you so that you can understand its functionalities by reading this article. The Download Yosemite DMG will be reviewed fully. So you are ready for your OS X Yosemite to upgrade to MacOS? Let’s go for it then. So let’s go.

Mac OS X Yosemite OverView:

It has been discovered that the shade of Mac OS X Yosemite shows a darker mode default compared to Mavericks when using low light, and apps such as “Finder,” “Toolbars,” “Application Switcher” and “Dock,” are supposed to be convenient. You can call Mavericks an old-fashioned OS that does not contain certain notification criteria by offering such variants-based improvements. Applause for your news center Yosemite, which has an interesting new feature in today’s panel, showing your gadgets like calendar, clock, the weather and a lot of other useful widgets.

In addition, various editing tools are available for optimizing images using accurate controls and adjustments. It also enables you to create photo books and tools for bookmaking of professional quality and new topics. Buy prints and new square sizes in a panorama. There are also more than 300 Emoji characters with highlights. Improving private browsing and improving safety and stability in browsers in Safari. Better wireless connectivity and performance significantly improve the operating system’s performance. Overall, Mac’s operating system is stable and reliable.

What is a DMG Image?

A Mac OS X mountable disk imager is a DMG file also known as a DMG image. It usually contains compressed and sometimes encrypted raw block data. DMG files are frequently used to install OS X software, which is uploaded to the Mac PC from the internet and mounted on the virtual disk. The DMG files are Mac computing specific, not Windows computing specific. Window Daemon Tools could, however, mount DMG images on virtual drives and convert DMG files to recognizable Windows formats from certain utility systems. In short, the DMG files are mainly for Mac OS X and Yosemite DMG download is one such software. You can also check out the El Capitan 10.11.1 DMG.

Features Of Mac OS X Yosemite 10.10.3

• Improves compatibility with certain email servers when using Mail
• Fixes an issue in Photos that prevented importing videos from GoPro cameras
• Fixes an issue in QuickTime Player that prevented playback of Windows Media files
• Browse your photos by time and location in Moments, Collections, and Years views
• Navigate your library using convenient Photos, Shared, Albums, and Projects tabs
• Store all of your photos and videos in iCloud Photo Library in their original format and in full resolution
• Access your photos and videos stored in iCloud Photo Library from your Mac, iPhone, iPad, or iCloud.com with any web browser
• Perfect your photos with powerful and easy-to-use editing tools that optimize with a single click or slider, or allow precise adjustments with detailed controls
• Create professional-quality photo books with simplified bookmaking tools, new Apple-designed themes, and new square book formats
• Purchase prints in a new square and panoramic sizes
• A new sleek look.
• Maildrop feature added.
• A flattened look and wider interface.
• “Photo” feature has been added to give the new sliding look to your snaps.
• Bugs form Mavericks are fixed.
• A solid and stable upgrade.
• A new “Finder” to locate the stuff stored.
• Improved Bluetooth and Wi-Fi connectivity.
• Deep integration with iOS devices.
• Enhanced spotlight searching.
• Safari seems to be more privacy concerned and having a clean design.
• Much More……./

Yosemite 10.10.3 DMG Technical Setup Details

• Software Full Name: Mac OS X Yosemite
• Setup File Name: Install_Mac_OS-X_Yosemite_10.10.3.dmg
• Full Setup Size: 5.8 GB
• Setup Type: Offline Installer / Full Standalone Setup
• Latest Version Release Added On: 17th of February 2017

System Requirements For Yosemite 10.10.3 DMG

Before you start Mac OS X Yosemite 10.10.3 DMG free download, make sure your PC meets minimum system requirements.

• Memory (RAM): 2GB of RAM required.
• Hard Disk Space: 9GB of free space required.
• Processor: Intel Pentium 4 or later.

Mac OS X Yosemite 10.10.3 DMG Free Download