- Step 1 How to create a bootable USB drive. If you're currently running macOS Mojave, click this link to find the Mojave installer in the App Store. For Catalina, click here. For all earlier versions of macOS, launch the App Store on your Mac, and search for the macOS version you want (this option is only available when running macOS High Sierra and lower).
- . If your Mac is using macOS Sierra or earlier, include the -applicationpath argument, similar to the way this argument is used in the command for El Capitan. Download mac activity monitor. Use the bootable installer Create Bootable Mac Catalina Usb. After creating the bootable installer, follow these steps to use it.
OS X El Capitan; Create the bootable Catalina USB drive. After everything has been downloaded, there is another few steps that you’ll need to take. First and foremost, make sure that that drive has at least 12GB of available storage. Then, plug the USB flash drive into your Mac.
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.
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,
Make Bootable El Capitan Usb On Catalina Mac
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
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
To create a bootable USB fo Mac OS X El Capitan you need to be able to convert the
InstallMacOSX.pkg to the Install OS X El Capitan.app, this can only be done on macs
that are capable or running El Capitan, this includes macs that have been upgraded to later OS's.
But crucially does not include macs that came preinstalled from new with a new OS.
Macs cannot run an older OS than the one they came preinstalled with.
Unfortunately Apple have not taken in to consideration that users may just want to create bootable
installers for older macs and not actually install the OS.
Make Bootable El Capitan Usb On Catalina Os
The mac you tried with that is running Catalina must have come with an OS newer than El Capitan pre-installed.
When you tried to download High Sierra even though you got the warning about it being an older OS than the
one you have installed did it not give you the chance to Download Anyway.
There is a workaround for the El Capitan problem if you are willing to try, read about it here.
Make Bootable El Capitan Usb On Catalina Operating System
https://apple.stackexchange.com/questions/379603/how-do-i-create-el-capitan-installer-on-a-catalina-or-post-el-capitan-installeI have not tried this for myself, but have linked other people to this article who faced the same situation, they reported back with positive results.
How To Make A Bootable Usb Drive
Mar 13, 2021 9:45 AM