In Magento 18.104.22.168, I have a product that I can ship or I can download so I created 1 simple product and 1 downloadable product with no visibility in Catalog. Then I created a Grouped product and I associated the above mentioned products.
This works, but customers in product page must manual insert "1" in quantity field of interest product and then finally add to card.
I'ld like constrain customers so they choose one of the 2 products simply by clicking over and then add to cart the selected product.
How can I do?