Hi,
First, the add to cart button now works on your product listings.
Second, the content area with the products, product page, checkout, etc now displays properly if I switch to the default template.
You have two problems left:
- your template's index.php doesn't display the "component" area of the pages:
docs.joomla.org/Jdoc_statements
So components, like HikaShop can't display their content on the pages, only modules can.
That's a big mistake of your template provider, so you should check on with them.
- You have canonical URLs in your products that use the menu item with the alias "hikashop-menu-for-products-listing", and you've activated the "force canonical URLs on listings" setting of the HikaShop configuration. So since the canonical URLs are used on the listings but that they are invalid now that the menu item has been removed, all the links to the product pages don't work.
A quick fix would be to turn off the "force canonical URLs on listings", but it would be better to simply edit each product and empty their "canonical URL" field. HikaShop will recreate the URLs automatically with another working menu item.