Download Zen-Cart module here

Upload 3 files:
      {zen-cart-directory}/includes/modules/order_total/ot_affiliatepro.php
      {zen-cart-directory}/includes/languages/english/modules/order_total/ot_affiliatepro.php
      {zen-cart-directory}/includes/functions/extra_functions/affiliatepro_functions.php

Setup affiliate pro module in admin:

• Login as admin into Zen-Cart
  
• Click on Modules -> Order Total
  
• Click on AffiliatePro tracking module
  
• Click on Install on the rigth side
  
• After Installation click on Edit and enter correct "Affiliate Installation URL"
  (your installation url http://your_affiliatepro_url/) and hit update button.

Insert purchase tracking script into current template of successful checkout page
(by default it is {zen-cart-directory}/includes/templates/template_default/templates/
tpl_checkout_success_default.php).

Use following code: