It's not meant for a full-blown DXF exporter but as a simple function to save a surface to a DXF-file. The DXF file can then be used by laser cutting or or other tools to do the job. For some, working ...
-Download the source code as a zip file and save to your PC (Do not unzip this file). -In Blender, navigate to edit -> preferences -> Add-ons. -Press "Install..." and navigate to the downloaded soure ...