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After the download is complete, your Mac will prompt you to do a restart, but at this point, you should completely shut it down.

As a first step, you may try deleting your outdated system files.

It removes only safe-to-delete files and is notarized by Apple.

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 Macs 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 well explain where to get one and what problems you may face down the road.

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.

If you arent comfortable with cleaning the Mac manually, there are some nice automatic room cleaners.

It deletes system junk, old broken apps, and the rest of hidden junk on your drive.

Thats 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.

The purchased section lists only those operating systems that you had downloaded in the past.

If you desperately need a lower OS X version build, consider creating a new Developer account among other options.

The membership cost is 99year and provides a bunch of perks unavailable to ordinary users.

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.

For the reason of being rather antiquated, Snow Leopard and earlier Apple versions can only be installed from DVD.

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.

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For instance, if your MacBook was released in 2014, dont 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.

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.

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