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![]() The chart below tells you how much free space is needed.Note, that it is recommended that you install OS on a clean drive. One more argument is that the free space on your disk translates into virtual memory so your apps have “fuel” to operate on. This includes not just space for the OS itself but also space for other applications and your user data. Prepare your Mac for installationGiven your Mac isn’t new and is filled with data, you will probably need enough free space on your Mac. Further down we’ll explain where to get one and what problems you may face down the road.We’ll be repeatedly referring to these Apple OS versions below, so it’s good to know the basic macOS timeline.STEP 1. That’s why going back to a past Apple OS version is problematic. 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)Normally, it is assumed that updating OS is a one-way road. Our favorite is CleanMyMac as it’s most simple to use of all. Locate the biggest files on your computer:Go to Finder > All My Files > Arrange by sizeThen 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”. Here are some ideas to free up space on your drive: ![]() 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. If you desperately need a lower OS X version build, consider creating a new Developer account among other options. Without App Store: Download Mac OS version as Apple DeveloperIf you are signed with an Apple Developer account, you can get access to products that are no longer listed on the App Store. Scroll down to find the preferred OS X version.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. Audacity App Store Mac OS X Directly FromBut before your Mac can run El Capitan it has to be updated to OS X 10.6.8. How to get macOS El Capitan downloadIf you are wondering if you can run El Capitan on an older Mac, rejoice as it’s possible too. 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. For the reason of being rather antiquated, Snow Leopard and earlier Apple versions can only be installed from DVD.The email edition comes with a special download code you can use for the Mac App Store. Both will cost you around $20. Purchase an older version of Mac operating systemYou can purchase a boxed or email version of past Mac OS X directly from Apple. “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. Update to 10.6.8 using Software Update.3. Install Snow Leopard from install DVD.2. Fonts on a mac for adobeThen 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. 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. 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. Now that the installation file is “captured” onto your external drive, you can reinstall the OS, this time running the file on your Mac. After the download is complete, your Mac will prompt you to do a restart, but at this point, you should completely shut it down. Within OS X Utilities, choose Reinstall OS X.Now the OS should start downloading automatically onto the external drive. Prepare a clean external drive (at least 10 GB of storage). Start your Mac holding down Command + R. Install older OS X onto an external driveThe following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. You can do it either with Time Machine or by creating a bootable USB or external drive.Instruction to downgrade from macOS SierraInstruction to downgrade from macOS High SierraInstruction to downgrade from macOS MojaveInstruction to downgrade from macOS CatalinaBefore you do it, the best advice is to back your Mac up so your most important files stay intact. How to downgrade a Mac running later macOS versionsIf 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. The same steps are valid for Mountain Lion and Mavericks. 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. You can also ask their assistance to create a bootable USB drive with the installation file. They should have image installations going back to OS Leopard and earlier. Visit your local Apple Store to download older OS X versionIf none of the options to get older OS X worked, pay a visit to nearest local Apple Store. The easiest way to do it is to run CleanMyMac X on your machine (download it for free here). Below are a few more links you may find interesting.
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