The add on files addonsetup1.exe, addonsetup2.exe and addonsetup3.exe constitute the add on module and can be downloaded from the download page

The add-on module adds five high quality 3D models of sperm cell, hemoglobin molecule, chromosome, nerve cell and a  microvilli -  and associated texts.   It also includes four animated clips of the diffusion across the cell membrane, red blood cell evolution, protein formation and immune system response. The animations are  accompanied by detailed texts. The basic module fully integrates the add-on module through adding additional menu options to display the new images, animations and texts.  

Once the add-on module three free trials expired, it lays dormant and waits for activation.   The basic unit will not recognize the ad on files and will not activate them until we e-mail you a registration KEY. The KEY will be e-mailed to you within minutes upon verifying that payment  ( 20 $US) was made. Payments are administered on line by  Regnow which accepts all major credit cards using a secure and real time transaction. To purchase the registration KEY please  follow the link to

 registration KEY