We have found one software suitable in our database for this conversion.
VectorWorks offers export to DWG format, so mcd to dwg conversion is certainly doable. But according to some users it might require modest knowledge of working with VectorWorks, because there are some key difference between .mcd and .dwg formats (for example layers).
Since VectorWorks files are not supported in 3rd party apps, there is really no alternative for such export.
Updated: January 19, 2023
MCD
Files with mcd extension can be mainly found as technical drawings from the VectorWorks CAD/BIM software.
DWG
A dwg file extension is used for common CAD file format, originally used by AutoCAD. A DWG is a proprietary format and can only be created in AutoCAD. Other CAD programs can usually import it, but not create its proprietary form. It's because of this, that DWGs are often exported to DXF interchange format, so they can be seamlessly used in other CAD programs.