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Steam is going to drop support for macOS 10.13 and 10.14 in February.

From Valve’s support document:

Unfortunately, macOS 10.14 was the last version to support running 32-bit games on macOS. Apple chose to drop support for 32-bit applications in macOS 10.15 (released 2019), and since many developers have not updated their games to support 64-bit executables, some games will effectively stop functioning on macOS. The Steam store will stop considering games that offer only 32-bit macOS binaries to be Mac compatible at the end of 2023. 98%+ of Steam customers on Mac are already running macOS 10.15 or newer. This means 32-bit only games and applications no longer run on your current operating system.

Steam’s support for macOS 10.13 and 10.14 will end on February 15th, 2024.