Every official Chrome app bundle has a cryptographic signature. When Apple issues a new intermediate certificate (roughly every 2-3 years), old signatures expire. A Chrome version from 2018 will trigger a "Google Chrome.app is damaged and can’t be opened. You should move it to the Trash" error.

This article provides a comprehensive deep dive into the world of legacy Chrome builds for macOS, covering where to find them, how to install them, the severe risks involved, and the technical hurdles Apple’s modern security architecture presents. Before hunting down a .dmg file from 2015, it is critical to understand the legitimate (and illegitimate) reasons for downgrading.

For nearly two decades, Google Chrome has been the gateway to the internet for billions of users. On a Mac, its evolution from a lightweight, "sandboxed" upstart to a powerful, resource-aware titan mirrors the shifts in web technology itself. But while automatic updates are a cornerstone of modern cybersecurity, there is a persistent, niche, and often controversial interest in old versions of Google Chrome for Mac .