The Help > About PowerDesigner window should give you the edition.
FYI, DataArchitect/DM (PD_DM) and DataArchitect/RE (PD_DMR) do not include the CDM feature.
Information Architect (PD_IAR) and EnterpriseArchitect (PD_EAR) do.
If not, you should find a file "sysam.properties" in the folder C:\ProgramData\PowerDesigner 16.
It contains the LicenseMode and Package used by the current installation.
If you are using a license that supports CDM and you cannot open/create CDM,
- select Sybase PowerDesigne 16.1 in Control Pannel > Programs > Programs and Features, click Change to make sure that CDM was selected for installation
- in DOS prompt, go to the installation folder and run pdshell16.exe -regserver
HTH