Hello my friend,
I worked in a prestashop certified company for 3 years. Now i am a freelancer with a portfolio that contains more than 80 custom websites and more than 40 modules.
I can handle any issue, bug, problems you encouter. I believe there is a php version that needs to be changed so ps1.7 can work but i have to make some debugging first.
Contact me so i can help you make your shop work.
Best regards,
Andrei