While a "Free Download" for the full modern version of Platypus II is generally not available legally (as it is a paid title), you can find the following related free materials:
Offers free Platypus Template Reports that include sections for appearance, habitat, and diet. Platypus II Free Download
Older versions or installers for the original PC release may be found on the Internet Archive , which hosts legacy software for preservation. While a "Free Download" for the full modern