Installing Prototype Widgets in Orange running on Mac
The easiest way to install Orange's addons is through the application itself. Open Orange, in the menu click Options -&gt; Addons. In the popup window mark Orange3-Prototypes and click OK. Note, that doing so you will get the latest version that is published on PyPi.

If you would want to install the bleeding edge version directly from github — assuming that you installed Orange by downloading a bundle from it's website and not for example by using Anaconda — do the following. Open a terminal and paste this command:

/Applications/Orange3.app/Contents/MacOS/pip install git+https://github.com/biolab/orange3-prototypes.git


Doing so you will trigger the pip that came with the bundle and instruct it to install the addon directly from github.

Further, to install opencv, which is required by some widgets (e.g. webcamecapture) run

/Applications/Orange3.app/Contents/MacOS/pip install opencv-python


Note, however, that this is unofficial version of opencv but it seems easier to install.