To create a bootable USB fo Mac OS X El Capitan you need to be able to convert the
Nov 01, 2018 In this El Capitan downloading process, if you are going to perform a clean installation method on the startup volume you have to create a bootable USB drive. Install El Capitan with USB can make. Step 3: Now the USB Drive is ready for OS X El Capitan installation. Make sure the copy of “Install OS X El Capitan” is there on /Applications folder. Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra First, review this introductory article: Create a bootable installer for macOS.
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.
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.
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.
Bootable Os X El Capitan
Mar 13, 2021 9:45 AM