Hi there, I am a professional eCommerece developer and I can fix current issue with your ZenCart and then will upgrade it to latest version( upgrading,i will make in separate directory so there will not any issue on Live site).
Please drop me a private message via chat or via the recruiter so that we can discuss the finer details of your project together.
Kind regards,
Imalak
https://www.freelancer.com/u/gurudave