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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.
Now that the installation file is “captured” onto your external drive, you can reinstall the OS, this time running the file on your Mac.
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.
After you’ve completed the download, the installer should launch automatically, but you can click Cancel and copy the file you need. Now the OS should start downloading automatically onto the external drive.If your Mac runs mac OS Sierra 10.12 or mac OS 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.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.If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab.