Hi Joseph,
The scripts and the addon are different things.
The github will always have the latest Bone Widget addon (spoiler alert: there’s an update coming soon)
The scripts are included inside the blend files, that I assume you have already download (ie – the source files) and the are also included as separate python files with the source download.
Switch to the text editor in your file and then take a look at the dropdown.

So download the source files and unzip if you haven’t already.