Why I do not see the GAMESS calculations listed in the calculations menu as an option? I see the instructions described in the Chem3D manual for calculating IR spectra using GAMESS in Chem3D 20.

Why do I not see the GAMESS calculations listed in the calculations menu as an option? I see the instructions described in the Chem3D manual for calculating IR spectra using GAMESS in Chem3D.

Please check the features available for each suite in the Software Requirements guide.  The GAMESS Interface in Chem3D is available only in ChemOffice+ Cloud / ChemOffice Professional. Unfortunately, the feature is not available in ChemDraw Prime and Professional suites.