ChromeOS is an incredibly fast, secure, and lightweight operating system, but downloading it as a standard ISO for any PC isn't straightforward because Google doesn't release official ISO files.
Google’s Chrome OS has evolved from a simple browser-based operating system into a fully featured, lightweight, and secure platform. Because it is fast, secure, and revives old hardware, many users look for a "Chrome OS ISO" to install on their Windows PC or Mac.
Insert a USB drive (at least 8GB) and follow the prompts to write the image.
with the Google Chrome browser installed.
: This is a Chrome browser extension that automatically downloads the latest stable version and flashes it to your USB drive. Source : Chromebook Recovery Utility (Chrome Web Store)