No specific info about version 16.4. Please visit the main page of SprinkCAD on Software Informer.
CAD Viewer lets you view, print and convert CAD files.
It converts among the three popular CAD drawings’ formats: DXF, DWG, and DWF.
Total CAD Printer automates the process of printing CAD files in batches.
A freeware viewer for P-CAD Schematic and PCB files.
Add AutoCAD markup and PDF markup capabilities to CAD Viewer 2016.
PointCloud CAD 2010 is a high performance CAD, Surveying and Point Cloud system.