Mac OS is not supported in The New Razer Synapse and Razer Synapse 3. However, it is supported in Synapse 2.0.
Razer Synapse 2.0 has support for certain devices for the Mac OS versions below:-
MAC OSX 10.10 (Yosemite) to 10.14 (Mojave)
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MAC OSX 10.9 (Mavericks) to 10.13 (High Sierra)
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MAC OSX 10.8 (Mountain Lion)
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MAC OSX 10.6 (Snow Leopard) /10.7 (Lion)
See the answer below for instructions on how to install Razer Synapse 2: