Google only provides a Chrome OS Flex USB installer created via the Chromebook Recovery Utility extension. There is no official ISO file for download.
Given that Google does not provide an official ISO, the term “Chrome OS Flex 2024 ISO repack” refers to unofficial, third-party-modified versions of the operating system. A “repack” is typically a file that has been taken from an official source, possibly altered, and then re-packaged into a different format (in this case, an ISO) for distribution on file-sharing websites or other online portals. chrome os flex 2024 iso repack