For the latest updates to the UPDM 2016 version, please download this release. The zip file includes:
To learn more about the Utility and Pipeline Data Model, please reference the ArcGIS for Gas solution site.
It's great that ESRI creates these free out-of-the-box tools for the GIS community to use. It would be even better if the documentation actually matched the tools that they were written for. Please revise the documentation for the updated UPDM to reflect the updated attribute, domain, and geometry type changes to the feature classes.