How to setup free download?

Hi,

That's the normal behavior as you're not supposed to be able to purchase something which is free. If you want to provide downloadable files for a free product you have the possibility to put a link to that file directly in the description of the product and it will appear on the product's page.

Hi,

If you don't sell products on your website and just want a download manager using hikashop with registration, then it's possible. You can directly tweak the views of HikaShop to do that:
remove the payment view from the checkout workflow option in the config.
Set a price in your products.
Hide the prices with this CSS that you can add via the tab display in the config: .hikashop_product_price_full{display:none}
or by editing the views.
Finally, you can also edit the order creation email (via the menu System->Emails in the Business version of HikaShop) and customize it to remove the stuff you don't need to send to the user.