It integrated the massive KB3125574 rollup , which contained years of fixes in one go.
The "Windows 7 All-In-One May 2018" ISO refers to a specific, community-driven collection that bundled every version of Windows 7—from Home Basic to Ultimate—into a single installer updated through May 2018. While not an official Microsoft release, it became a legend among IT professionals and enthusiasts during the OS’s final years. The Story of the "May 2018" Legend windows-7-all-in-one-may-2018
Unlike later "bloated" versions, the May 2018 builds were often praised for being lean, stable, and ready to work right out of the box without the telemetry and "nagware" that started appearing in late 2019. It integrated the massive KB3125574 rollup , which