Hi! Welcome, and it looks like an interesting project. Actually the answer is already in your link, please follow from “Step 3: Download the Codeable Objects library” to download and properly install the missing library.
I did follow those directions put am unable to access the files.
When I attempt – Sketch Import Library, these files are not available.
When I attempt – Sketch Add File, the file will load but I receive the error – The package “com.design” does not exist. You might be missing a library – when I attempt to run the file.
oh I see. Sorry that obviously I didn’t check the link
I think what you can do is to contact the people on the website to see if they have a copy of the library. But it seems the project is quite old, based on Processing 1.x while the current version is 3 so you may encounter more issues running the program even if you get the library.