Download Extensions for ArcGIS Pro from My ESRI
The Data Interoperability and StreetMap Premium extensions for ArcGIS Pro are available from My Esri.at http://myesri.com. The other available extensions are installed with ArcGIS Pro.
Please note that the version of the extension must match the version of ArcGIS Pro that you have installed.
If you are using the most recent version of ArcGIS Pro
Log into My ESRI>Select Downloads>ArcGIS Pro (Current Version)> Extension Name>Download
If you are using an older version of ArcGIS Pro
Log into My ESRI>Select Downloads>All Products and Versions>All Versions>ArcGIS Pro (Version Required)>View Downloads>Extension Name>Download
For more detailed instructions, please see the following article on how to download software from myESRI: https://support.esri.com/en-us/knowledge-base/how-to-download-and-install-software-from-my-esri-000029644