Thank you for using our software portal. Downloading the required product from the developer's site using the official link provided by the developer to ArcMap 3D Viewer below was possible when we last checked. We cannot confirm if there is a free download of this software available.
However, we must warn you that downloading ArcMap 3D Viewer from an external source releases FDM Lib from any responsibility. Please carefully check your downloads with antivirus software. FDM Lib takes it upon itself to provide free download links and inform users when the developing company starts providing a version of ArcMap 3D Viewer for direct download.
Download from www.esri.com