I downloaded svg convertor from the link you shared, but it is not converting the file.
I searched first 20 Google results, all results are having 2 setups and none is working.
Now you tell, how can I accept your above reply as solution?
Consider using AutoCAD's WMFOUT command to create a WMF file, then find a WMF to SVG conversion tool on the web, this one may work.
You only accept it if it's a solution: does it really need to be explained
Did you contact their support for help (http://www.dwgtool.com/support.htm)? Demo may have a file size limit, they also require R2010 or lower format with no roundtrip or AEC content in the file, worth seeking help from the program creators if the other post above is not an option.