Steam will stop working on macOS Yosemite and earlier versions of the OS
Online distribution service computer games and programs Steam recently announced that it will stop supporting older versions of macOS, from 1 January 2019.
Starting from 1 January 2019, the Steam will officially end support for versions of macOS 10.7 (“Lion”), 10.8 (“Mountain Lion”), 10.9 (“Mavericks”) and 10.10 (“Yosemite”). This means that after this date the client version of Steam will no longer work on these versions of macOS. To continue using the Steam service, games and other …