If you use pkgutil to expand the InstallMacOSX.pkg it opens to three items, the Distribution file, InstallMacOSX.pkg and Resources. You can alter the Distribution file to ignore the supported platform check, see below.

Now Must Watch Above Video For How To Make Mac OS X El Capitan Bootable USB 4. Now Boot From USB Flash Drive 5. Click On Next Again Next Select Language 6. Select Mac OS X El 10.11.6 install And Press Enter/Click 7. Open Disk utility Format Whole Hard Disk Now Make Partitions 8. After Making Partitions Close Disk utility 9. Once you’ve done that, here’s how to install, reinstall, or upgrade to El Capitan, step by step: Boot from your Recovery HD partition by restarting your Mac while holding down the Command+R keys. The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X El Capitan splash screen appears. Several drives will be displayed, but only the ones that have bootable media installed. Pick your USB drive using a double-click with the mouse pointer or by using the arrow keys and Return (enter) on a keyboard. Now the Mac is booting from external USB. The process of installation has now begun. Let's go through the final steps to install.

Creating the Install OS X El Capitan.app on a mac that came with a newer OS than El Capitan.

Apple officially released OS X 10.11 El Capitan operating system in September 2015 as an update through Apple App Store. This actualization will update core of your system and preserve your user data. To create bootable USB installer for Mac to Install Mac OS X El Capitan on Windows, on Mac or VirtualBox, you have to create bootable USB flash. Mac OS X El Capitan: Being the 12th major release of macOS, Mac OS X El Capitan belongs to the Macintosh-Unix family of OS. It was majorly released for server OS for Macintosh computers and Apple Inc.’s desktop. Being the successor of OS X Yosemite, it mainly focuses on stability, performance, and security. There is a history in its name.

Download the InstallMacOSX.dmg from Section 4 of How To Upgrade To El Capitan

Double-click to open InstallMacOSX.dmg to Install MacOSX.pkg.

Drag InstallMacOSX.pkg to the Desktop.

Open Terminal, enter the text

A folder will be created on the Desktop after a while with the contents of the .pkg file.

In there you will see an item called Distribution, Control-click on that and select Open With

go to Other and select Text Edit.

When the file opens scroll down to the section that reads,

Install Mac Os X El Capitan From Usb

function isSupportedPlatform(){

type in at the end return true; so it now reads as,

function isSupportedPlatform(){return true;

Now click Save and close the document.

Go back to Terminal and enter the text,

press Return, after several minutes, be patient, (check to see if the prompt has returned to Terminal) a new package will be created on the Desktop.

When created double-click on that and an installation window will open where you will now convert the

Bootable El Capitan Installer

new InstallElCapitan.pkg to the Install OS X El Capitan.app which will be placed in your Applications folder.

You can now create a bootable USB using the install app and createinstallmedia,

If you have the time I would be grateful if you could give this a trial, it works here on my mac, but I would like confirmation from yourself or any others reading this that the procedure works on macs that came with macOS Sierra or newer pre-installed. Oh and tell me if my description of the procedure is easy to follow and understand..

Jan 15, 2020 12:58 AM

Hi, I have an old iMac mid 2007 running Leopard 10.5.8 and I upgraded the RAM to 4GB from 1GB.

I tried to install a new copy (clean install from USB booting) but can't do that.

I've done the following steps:

1. I created an USB bootable El Capitan installer
2. I booted from USB
3. I erased all the HDD content and I created a new partition
4. tried to Install but I got this error: 'OS X could not be installed on your computer. No packages were eligible for install.'

I don't know what can I do at this point.

Thank you for all your help!

Posted on Nov 16, 2019 3:45 AM