-
Download
nquake_installer-macosx-latest.tar.gz
from the releases folder. -
Unpack it:
tar xvzf nquake_installer-macosx-latest.tar.gz
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Now cd to the unpacked directory and run the install script:
cd nquake_installer-macosx-latest/ ./install_nquake.sh
Depending on your architecture, you might have to compile your own ezQuake binary. You can find the ezQuake source code here: https://github.com/ezQuake/ezquake-source