The toolbox has been updated (01-08-2018), by Shaun Walbridge with ESRI, to be compatible with Python 3 and ArcGIS Pro and is still backwards compatible with Python 2.7 and ArcGIS 10.x. Please cite ...
Extend ArcGIS Pro with ArcGIS Pro Metadata Toolkit. The ArcGIS Pro Metadata Toolkit is based on the add-in and configurations extensibility pattern. This toolkit provides resources to support ...