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.

Create bootable usb for mac os x el capitan with transmac. A new pop up box will appear, click on the three dots, and then select the macos x el capitan.dmg file from windows. Then click on ok. Choose mac osx el capitan dmg file. Since the file is huge so it will take quite time to complete. It may take about 20 to 30 mins or more. As usual, Apple no longer supply a bootable USB Flash Drive with latest OS X releases – including the new OS X 10.11 El Capitan. Using this tutorial you will be able to create your very own bootable USB Flash Drive using Apple’s newest operating system, El Capitan, in 3 easy steps! Command used in this video. Finally, I could boot up the Mac while holding 'option/alt' and my USB drive appeared as a bootable device! 17 minutes later I can startup OSX! I may go ahead and re-download the installer and create a new bootable USB using 'createinstallmedia', just in case there was a problem with the image I used, but at least now I can boot up the computer!

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

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,

function isSupportedPlatform(){

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

Create Bootable El Capitan Usb From Dmg

function isSupportedPlatform(){return true;

Make Bootable El Capitan Usb Installer

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.

Create Bootable El Capitan Usb From Windows

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

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,

How To Make A Bootable Usb Drive

Make Bootable El Capitan Flash Drive

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