To understand why there is no official ISO, you have to understand Chrome OS’s architecture. Unlike Windows or standard Linux distributions (like Ubuntu or Fedora), Chrome OS was never designed to be installed on a generic hard drive.
Brunch is not an operating system; it is a boot mechanism. It acts as a translator between generic PC hardware and the Chrome OS recovery image. Instead of downloading a fake ISO, you download the official Chrome OS recovery image (intended for Chromebooks) and "inject" the Brunch framework into it. download google chrome os iso 64 bit exclusive
Introduction Chrome OS is Google’s lightweight operating system designed for web-centric devices. There is frequent user interest in obtaining a downloadable 64-bit ISO of Chrome OS to install on generic PC hardware. This paper surveys why such an ISO is not officially provided, the legal and technical implications, and practical alternatives. To understand why there is no official ISO,
: Only available on official Google-certified devices; supports Android apps and the Google Play Store. It acts as a translator between generic PC
: The recommended way to "download" and create an installer is through the Chromebook Recovery Utility extension in the Chrome browser. Why You Won't Find an "Official" ISO