https://eshop.macsales.com/blog/33160-how-to-create-a-bootable-el-capitan-usb-install-drive-with-diskmaker-x/
Create Bootable El Capitan Drive with DiskMaker X for Mac
Sep 25, 2019 - In this article, we'll show you how to create a bootable El Capitan USB install drive with DiskMaker X (Disk Maker X) for El Capitan on your Mac!
el capitandiskmaker xcreatebootabledrive