Need help adding functionality to WordPress plugin

There is an Ultimate Affiliate Pro WP plugin for sale on Code Canyon. The author says he’s available for hire but has not responded to my requests.

His affiliate script does everything I need except 1 thing. It has different types of MLM plans (binary, forced matric) but I need to add reverse 1up (pass up) functionality. That’s it. I have been told by my college professor who teaches coding that this should be fairly easy and take no more than 3 hours to do… and that I will know how to do it by next semester. The thing is, I need it done now. Please let me know if you have the ability to add this. $50/hour x 3 hours.