PerkinElmer, the software vendor, changed the download and licensing system starting with ChemDraw v17 (about Spring 2018).
See also
License and Version history
- July 2018: Cornell Library committed to a 3 year license
- Apr 4, 2018: ChemDraw Professional v17.1 announced
Installing and using ChemDraw requires both the software and a license key
Registration problems and related documentation
Windows (maybe also possible on Macs?)