If you can install the free software Inkscape (http://inkscape.org/) then you can convert your svg to a pdf file (as it can saves as pdf).
You can then use anonline website http://www.pdftodxf.com/ to convert pdf to dxf...
Or alternatively, you can find also free-to-try programs like "Any PDF to DWG Converter" (or others) to do the same thing. After that, autocad can open dxf and save as dwg...
Best of luck!
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