Since Meta no longer hosts these files, you must rely on third-party repositories or the App Store's built-in "last compatible version" feature.
Caprine is an open-source, third-party Messenger client. It looks exactly like Messenger v60. It uses very little RAM, has dark mode, and blocks read receipts. You can download version 2.58 (the last stable Intel build) from GitHub.
For a long time, Facebook did not have a dedicated native app for macOS. Instead, they pushed a wrapper of their mobile website or directed users to .
The internet Archive stores old versions of Facebook’s CDN links.
There is no official legacy portal provided by Meta. However, there is a legitimate way: or third-party repositories that archive official .dmg files.