In the February release of ArcGIS Pro (version 3.1) The ability to load S-57 into ArcGIS Pro will be available. The replacement behavior for the old ArcMap S-57 Viewer is called the S-57 Layer in ArcGIS Pro. Simply click the Add Data button and browse to a .000 file to add it to the Map. Once you have S-57 data in the Contents Pane, a new ENC Layer tab will appear on the ribbon. On this ribbon you will find the Symbology button. If you click on that, it opens an S-57 symbology user interface with the S-52 symbology controls.
No separate install or extension is required, this new ENC Layer capability comes natively with ArcGIS Pro.