Running conda manually without the installer script (see the manual), and running ARTIQ on MacOS, are not supported.
IIRC Chris from Oxford had some luck running it on MacOS (compiling/installing it from source code), but it needed quite a bit of tinkering and a few things weren't working. You may want to install it via Nix however (which wasn't there when Chris installed from source), which especially on MacOS has a much higher chance of success than conda.