Can't install Chrome extension directly from source

[anakin-ada]

Here is what I do:

1. Download source code (Zip file) from Github, unzip to get “nami-main” folder
2. Open Chrome developer mode, click “Load unpacked”
3. Browse to subfolder “nami-main/src” where "manifest.json" is, click Select
4. Get error “Failed to load extension” because various files are not there (background.bundle.js, contentScript.bundle.js, for example)

What do I do?
How do I reproduce the extension?