Making a thumb drive of El Capitan would be the simplest way to approach this!

1. El Capitan Os X Download
2. Download El Capitan Installer
3. Clean Install El Capitan Usb

Reinstall El Capitan Without Erasing the Drive. Boot from the USB installer. When the splash screen appears select the target drive. From the screen's menubar you will see a Utilities menu. Select Disk Utility and use it to do the the following: When the recovery menu appears select Disk Utility and press the Continue button. How to Perform a Clean Install of OS X El Capitan. OS X El Capitan (OS X 10.11) offers two installation methods. This guide focuses on the 'clean install' method. When you install El Capitan on your current startup drive with the clean install method, you erase everything on the drive. That includes OS X, your user data, and personal files. Using the DMG download of OSX 10.11 El Capitan (see above) and making a bootable USB-installer with Diskmaker X I finally managed to install 10.11 without installing 10.6.8 Snow Leopard first! I don't know if I was refused to do this before because I had either tried to install it on a partition on a drive or because I named the partition prior.

First off, install that upgraded RAM into the iMac as you will need the speed. After you've done that, boot the computer up normally, open the Appstore, and download OS X El Capitan from the Appstore, so that you can make a USB flash drive out of it.

Once El Capitan finishes downloading, download DiskMakerX from here

This program will automatically create a bootable El Capitan flash drive for you to use to install El Capitan on the computer.

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After the program finishes and creates your flash drive, turn off the computer, take out the old HDD, and throw in that SSD you bought.

Now that you've done all of that, plug in the flash drive into the Mac and hold down the ALT key and select the flash drive to boot up from the flash drive and install OS X El Capitan onto your mac.

El Capitan Os X Download

Once it finishes installing you're done! You'll then be presented with the OS X setup screen and you'll be ready to start using your computer!

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Dec 2, 2015 7:40 PM

Start up from macOS Recovery

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

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Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
• Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

• On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you're offered the macOS that came with your Mac, or the closest version still available. If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. Otherwise you're offered the macOS that came with your Mac, or the closest version still available.
• If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. If you just erased your entire startup disk, you may be offered only the macOS that came with your Mac, or the closest version still available.

Download El Capitan Installer

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

Clean Install El Capitan Usb

• Use the App Store to download and install the latest macOS.
• Use the App Store or a web browser to download and install an earlier macOS.
• Use a USB flash drive or other secondary volume to create a bootable installer.