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.

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A list of all Mac OS X versions

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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.

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.

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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.

No matter how much space you have on your Mac, one day, you may see a “Your disk is almost full” notification. Even if it seems like there is no app or program that would take a considerable amount of storage, the large files may be hidden deep down in your Mac’s memory. Keep reading to discover how to locate such files on your Mac and delete them for good.

Scan the most obvious place

When looking for large files on their Macs, users often start scanning a bunch of folders stored on their machines. But, usually, the most common destination of all large files is the Downloads folder. You may automatically download thousands of files and forget to remove them. So, checking the Downloads folder on your Mac may help you find lots of forgotten large files and documents that you don’t need anymore.

Looking for the large items may take some time. Free tools, like CleanMyMac X, can accelerate the process by scanning your Mac’s memory and detecting large files. The only task left for you will be to remove the found files all at once.

Find large files using Finder

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Another way to search for large files is by using search filters in Finder. It can help you locate the biggest files on your Mac. Here’s how to find large files using Finder:

1. Open Finder.
2. Find the Search field in the top right and click it.
3. Click the Settings symbol and select Show Search Criteria.
4. In the list of search filters on the left, choose Other.
5. In the window that appears, select File Size and click OK.
6. In the second space, select Is greater than and enter the size in the third space.
7. Choose KB, MB, or GB in a final filter field.

Remember to select This Mac to get a full list of results. You will then see all files which size is greater than you defined. Look through the found documents and remove unnecessary items that take too much space on your Mac.

Although, this method has certain disadvantages. Finder doesn’t give you a full picture of the large files stored on your Mac. It shows only single files, excluding large folders that comprise a lot of smaller items.

It’s also unclear which files you can safely delete without the risk of removing important documents. Finder neither provides any additional information about files nor shows which folder the file belongs to. So, it’s difficult to decide whether the large file is important or not.

Continue reading to discover how to find the largest files on your Mac using other methods.

Find large files using the Storage Management app

Another solution is to use the built-in Storage Management app.

1. Choose Apple menu.
2. Select About This Mac.
3. In the window that appears, click Storage. Here you can see how much free storage you have and view the amount of space used by different categories.
4. Click Manage.
5. As the Storage Management app opens, select Documents.
6. Browse the Large Files to delete those you don’t need.

Click any file to see its path at the bottom of the window. The Storage Management app also shows the exact size of each document as well as the date you opened it last.

Apple provides helpful recommendations at the top left to help you optimize your storage. Here you can choose to store all your files in iCloud, remove large files like movies and TV shows, turn on Empty Trash Automatically, and reduce clutter.

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This method is great for those who don’t have a lot of large files on their Mac. But, if you tend to keep many files on your machine, you may consider using the Storage Management app tiresome.

How to find biggest files on Mac via Terminal

Another way to locate large files on your Mac is to use Terminal. Although some users find commands complicated, if you use them correctly, you can find anything on your Mac. So, you can locate the biggest files on your device, just like that:

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1. Go to Utilities and open Terminal.
2. Execute find command. If you want to locate all files bigger than 1G under the /home directory, for example, type find /home -size 1G.
3. To delete the files enter
   find /home -type f -name *.avi -size +2G -exec rm {}
   This command will remove all AVI files that are greater than 2GB under the /home directory.

Using this command, you can also limit your search, setting size filters. Then your command will look like this: find /home -size +30M -size -100M. This command will locate all files that are greater than 30MB but less than 100MB.

Locate and remove large files using CleanMyMac X

If you have enough time, you can look through all data stored on your Mac using the methods described above. In case you want to speed up the process, CleanMyMac X can prove useful. Thanks to its Large & Old files feature, you can look at the bigger picture of all large files found on your Mac and delete them altogether.

Here’s a short instruction on how to find and delete large files using CleanMyMac X:

1. Download the free version of CleanMyMac X and open the app once it’s installed.
2. Click the Large & Old Files tab.
3. Run a quick scan.
4. CleanMyMac X will show you all files stored on your Mac. You can sort files based on their size, type, and access date, to see the large items that can be removed from your Mac.
5. Check the boxes for the files you want to delete and click Remove.

Using CleanMyMac X, you can remove all unnecessary files quickly and make some space for more important documents.

So, these were some simple methods of how to view all files on Mac and delete them. You can either use Finder, the Storage Management app, or Terminal to find the biggest files on your Mac and clean up your machine of them.