A Required Download Is Missing Mac Os X 10.10
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Install Os X Required Download Missing
A Required Download Is Missing Mac Os X 10.8
A Required Download Is Missing Message When Resetting Mac Os X To Default Setting

An installation error occurs sometimes for when upgrading from OS X Snow Leopard to OS X Lion “Can’t download the additional components needed to install Mac OS X” – Check your network configuration as the install needs to pull down software over the internet.

A Required Download Is Missing Mac Os X 10.10

But the network configuration is OK.!

Reinstalling your Operating System can sometimes be a necessary measure, but that does not make it any less tedious. This applies to all of the Operating Systems out there, including OS X.
The following instructions do triple duty: Of course they’re what you do to install OS X for the first time on a Mac or a freshly formatted hard or solid-state disk. But they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from, or if the version of OS X on your Mac.
Apple's let the OS X Yosemite beta out into the world, but it's not without its problems. In fact, two quirks are causing issues before you can even download the software. Here's how to fix them.
At this point, the Mac should start to download the recovery files from the internet and show a status bar. When complete, it should reinstall macOS Recovery and reinstall macOS on the main partition.

Edit 2: Restarted the internet recovery and it made it through but it hangs up after starting to install OS X Lion and says 'can't download the additional components needed to install Mac OS X. Guess I'll try to create a USB start up?

Check that Software Update can connect directly to Apple Software Update Servers not a custom internal one, remove any Managed Preferences if it is a managed host.

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Option 1

If that still doesn’t get rid of the message I have found on a device that the drive needed to be reformatted – the only thing different about the drive I was trying to install to was that it had a Boot Camp partition on it The Boot Camp partition might be a red herring but certainly reformatting the disk solved the issue.

So:

Install Os X Required Download Missing

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clone the main HD drive to an external disk use CCC – link below
boot from the external
erase/reformat the main HD – use HFS Extended Journaled
clone back the main HD from the external
reboot from the main drive
run the installation upgrade again

This time – no problems.

If you don’t care whats on the disk just erase it and run the upgrade, I wanted to keep all the data intact in my example, hence the clone back.

A Required Download Is Missing Mac Os X 10.8

Cloning courtesy of the fantastic bombastic CCC.

Option 2

A Required Download Is Missing Message When Resetting Mac Os X To Default Setting

Another potential solution is to remove any RAM over 4GB run the install and then put the additional RAM back in after – even then try and limit the RAM slots to one, so not 2GB in each – rather 1 slot with 4GB.