Do anybody know how is possible migrate goods from this old version to the newest one please? We have about 550 kinds of goods in our shop and it would be difficult to migrate everything one by one by hand. I bag you for help. Thank you in advance.
Yes, it is possible. But converters from 3.x to 4.x are no longer available on producer page: https://opensolution.org/download/quick.cart-and-quick-cart-ext-other.html There is only from 4.x. So I suggest you as they describe in above page: "Do you want to update the shop from an older version or need assistance in the implementation of migration? Contact our partners »"