Hello,
let me offer you my prestashop skills.
I can help you move all data you need (categories, products what ever you need) from 1.6 to 1.7
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I work daily with prestashop over 5 years. I know prestashop from top to bottom. I am familiar with every aspect of this eshop system. Prestashop settings, tweaking, modifiing core and theme files, custom module development, you name it.
You can also check many of my positive reviews here on freelancer.
Thank you for your time.
Best Regards,
Jarda Nalezny