The NewHtmlReport GitHub repo has the whole project, and the Releases page has the link to the .zip file with just the PowerShell module code itself.
The module is now a bit more modern, as we have added things like:
- support for accepting objects from pipeline in the New-HtmlReport function
- cmdlet-based module configuration
- JSON-based module configuration storage
- CDN-based resource usage for the jQuery and TableSorter JS libraries by default, for ease of "getting up and going" right out of the box
Also, the ReadMe has good info about the module, including the Quick Start steps, and the ChangeLog has more detail on what things changed and how.
Enjoy!