There was an error in the readme file. It should actually read, "Copy the visualization configuration file “Visualization.ucf” to the Microstation workspace..."
The installation of the Civil Content for Visualization delivers a UCF file, not a CFG file. This file should already be in the correct location, and you should simply be able to select the Visualization workspace when you launch MicroStation. If not, search for "Visualization.cfg" and copy this file to the Microstation workspace standards configuration.