Conversion from cdt to cdr is basically standard workflow in CorelDRAW and represents creating a CDR graphics from CDT template based on predefined settings. It is unlikely any other program would be capable of handling .cdt templates for this purpose.
Convert CorelDRAW template file to CorelDRAW vector or bitmap graphics.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert cdt to cdr on Windows
A set of applications used by professional graphic designers
Convert from cdt 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.