Mac-os-x-el-capitan-10-11-6--15g31---intel---usb-flash-drive-to-install----sadeempc

El Capitan is generally for Macs from 2007–2015.

If you have the official .dmg from Apple, follow these steps to make your own installer: El Capitan is generally for Macs from 2007–2015

When you download a "USB Flash Drive To Install" package from a third-party site, you are bypassing Apple’s security chain. you are bypassing Apple’s security chain.