Checkout workflow

It sounds like you're describing the default screen of the checkout. Am I missing something in your explanation ?

If you don't see the shipping address selection it's because the option " Force shipping regardless of weight " is turned off (if you edited the views of the checkout from an old version of HikaShop and then updated, it's possible that the view doesn't include the modifications in order to display the interface when that option is turned on) and that you didn't set any weight in your products.
An easy solution is to set a weight on your products...

Could you give a link to your shop ?

We checked on our end and there is indeed a problem with the option of the configuration.
Could you change the line:
$done->has_shipping = $shipping;

by:
$config =& hikashop::config();
$done->has_shipping = $shipping || $config->get('force_shipping');

in the file components/com_hikashop/controllers/checkout.php

and the line:
$this->has_shipping = $shipping;

by:
$config =& hikashop::config();
$this->has_shipping = $shipping || $config->get('force_shipping');

in the file components/com_hikashop/views/checkout/view.html.php ?

That should correct the problem of the option not being taken into account.
For the fact that even with a weight it doesn't display the shipping, you should use grams instead of kgs. It's a conversion problem where the rounding of the values results in the weight being 0.

We tested the modification on our end and it has solved the problem for us. Could you double check the modifications ?

With the modifications above, if you have the option " Force shipping regardless of weight " turned on, you should not have to set weight in your products.

For the registration, the address fields and the user registration fields are on the same screen in order to reduce the number of steps the user need to go through in order to buy on your website and thus increase the conversion rate.
You can't dissociate both in HikaShop. If you want to do it, you will have to edit the views of the checkout in order to do it.

We are thinking of doing an update before next week. But that doesn't change the fact that this fix should work and that's the only fix we made on our end regarding the problem and that has solved it for us.

What do you mean by "in another copy i made the changes but it doesnt works" ?

In your previous message, it seemed that you had found why the modification didn't had solved the problem and that it was now working...

Could you provide a back end access to your website so that we can check your settings ?

You didn't had any shipping method configured.