Dear sir, i have read you project description very carefully and checked attachment screen-shot and now i am make sure that it's not php version related issue. as you are getting 500 internal server error it could be due to some misconfiguration of server, file structure or .htacess.
please share me website login details so that i can fix this issue asap.
It would be great if you consider my bid. I will be waiting for your positive and fruitful response.
if you want we can discuss more on chat.
My skills are:
Wordpress,Woo-commerce
Wix,Shopify
PHP, Codeigniter, laravel
HTML5,CSS3, Jquery, JavaScript
Thank you very much in advance!!