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macos - How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer? - Ask Different
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How to Create a Bootable Install USB Drive of Mac OS X 10.11 El Capitan « Mac OS Tips :: Gadget Hacks
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Amazon.com: Bootable USB Stick for macOS X El Capitan 10.11 - Full OS Install, Reinstall, Recovery and Upgrade
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