You can download it from the Microsoft Store or Mac App Store.
Facebook has released the Messenger app for macOS and Windows, which allows you to video chat on your desktop computer.
According to Facebook, over the past month that the number of users using desktop browsers for audio and video calls in Messenger has increased by 100%. Applications for macOS and Windows will eliminate the need to use the browser version, providing all the features, including unlimited and free group video calls.
The advantages of the desktop version of Facebook Messenger include group video calls on the big screen, ease of connection, multitasking support, the availability of notifications, the ability to synchronize chats on computers and mobile devices. Dark Mode and GIF are included. You can download the application from the Microsoft Store or Mac App Store.