Cocooninstallation steps

1- Download Cocoon plugin for Grasshopper from Bespoke Geometry. 

2- Unzip the folder and make sure that the Grasshopper file is unblocked (right-click on it and unblock it).

3- Copy the files to the "special folders -> component folder" of Grasshopper.

4- Restart Rhino/Grasshopper after installation is complete.

Learning resources:

Watch this youtube video tutorial on using cocoon.