[SXX]

Its ported to Linux just like cs 1.6. Not sure how good Mac build is though.

[nomel]

Steam version: This product is not compatible with macOS 10.15 Catalina or above.

[jamesfinlayson]

Yeah Apple's latest round of breaking changes hasn't been addressed (and seemingly won't be).

The Linux and Mac ports happened in 2013 or so (presumably getting one working went a lot of the way to getting the other working, though there is some speculation that Apple poured in some money to help make it happen).