Checkout without Registration - free version

Hi,

Guest checkout is a feature of HikaShop Essential and Business. You can activate it after setting the "Registration" setting to "Guest" under the "Checkout" tab of the Hikashop configuration page.

Now for your issue, you need to add back the "login" view in your checkout workflow.
Then, I would recommend to turn off the new account activation setting of the Joomla user manager options page.
That way, the users won't have to activate the account after the registration and will be auto logged in after the registration form so it will be almost as simple as with a guest form (they'll just have the name, username and password fields to fill in on top of the other fields which are also there with the guest checkout).