If you want the legally (and ethically), here are the best current options that satisfy the "download" intent without breaking the law.
"When you are studying for the NBDE Part I or the INBDE, you don't just need to know where the lingual nerve is," says Dr. Sarah Jenkins, a faculty member at a leading dental school. "You need to know exactly how it relates to the third molar so you don't paralyze a patient’s tongue during an extraction. Netter’s diagrams offer a clarity that cadaver photos sometimes can't, stripping away the noise to show the functional anatomy." If you want the legally (and ethically), here