Hello Sir,
I am an expert Opencart developer and I will upgrade you Opencart store to latest version.
My quote will depends on your existing store and if any additional requirements you have.
So kindly send me your existing url.
I will take all your data:- products, categories, customers, orders, Information pages, manufacturers, options, Attributes and all date.
Let me know if you have some customization.
Also let me know which theme are selecting from marketplace?
Kindly respond for my bid so we can discuss further.
Regards,
Pratibha