0.6.20 Installation issues - image not found

New Indigo user here, so hopefully it's nothing silly I'm doing.
I've loaded the plugin and tried to enable but getting the following message:

Enabling plugin "Sonos 0.6.20"
Starting plugin "Sonos 0.6.20" (pid 8279)
Sonos OSTYPE: 13
Sonos Error Error in plugin execution InitializeMain:

Traceback (most recent call last):
File "plugin.py", line 9, in <module>
File "/Library/Application Support/Perceptive Automation/Indigo 6/Plugins/Sonos.indigoPlugin/Contents/Server Plugin/Sonos.py", line 39, in <module>
File "./lib/zmq/__init__.py", line 35, in <module>
<type 'exceptions.ImportError'>: dlopen(./lib/zmq/utils/initthreads.so, 2): Library not loaded: /usr/local/lib/libzmq.1.dylib
Referenced from: /Library/Application Support/Perceptive Automation/Indigo 6/Plugins/Sonos.indigoPlugin/Contents/Server Plugin/lib/zmq_10.6/utils/initthreads.so
Reason: image not found

Stopping plugin "Sonos 0.6.20" (pid 8279)
Stopped plugin "Sonos 0.6.20"
Error plugin "Sonos 0.6.20" (pid 8279) failed to start -- restarting in 5 seconds
Disabling plugin "Sonos 0.6.20"

Installation instructions are here: https://vulture.lagaros.com/wiki/pages/z3K6d1S1q3/Installation.html.

There is a little bit more to do outside of installing the plugin in Indigo.

Hope this helps.

...and there we go - thanks for pointing out the obvious! No idea how I missed the installation instructions