There it was. But he needed a specific XREF (External Reference) path that had been moved during the server migration of 2018. He needed the "15 Link"—the folder designated for the 15% design concept phase that contained the raw survey data points.
That’s Autodesk’s Download Manager format. Run it, and it will pull the full installer from Autodesk’s CDN – but only if your session is authenticated. If not, it will fail.
More flexibility in creating custom parts.
: A modern "dark" theme was introduced as the default, along with a "New Tab" page that organizes "Learn" and "Create" resources.
Before attempting to install AutoCAD Civil 3D 2015 (Version 15), ensure your hardware meets the necessary benchmarks. This version was designed during the transition toward more robust 64-bit processing.