One of the possible mcl to mcc conversion would be using templates (.mcl) to make finished CAD files (.mcc) using VectoWorks software. This seems to be standard workflow to quickly make new files based on existing templates and not a conversion in proper sense.
Convert VectorWorks template file to CAD drawing.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert mcl to mcc on Windows
A 3D modeling and rendering tool for Windows
Convert from mcl file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.