Upgrade a PHP script

Kindly review https://codecanyon.net/item/gain-salon-booking-system/25945604 this salon script. We have already purchased a license and have the code for this script. We need you to modify this script for our business. Kindly go through the ppt attached and only bid with FINAL bid and questions and correct timeframe.

Do not blind bid or post your profile here, read the PPT and ask me questions and discuss the project.