How do you do instant downloads?

Newbie question. I've seen some posts having to do with paypal ipn and instant downloads, but I'll be using AuthorizeNet. Is there any way to do instant downloads with download products instead of the email link or going to your account, and then files, and then download? It would be nice to add to shopping cart, checkout, and then be redirected directly to the file download instantly. Is that possible?

It would be nice to add to shopping cart, checkout, and then be redirected directly to the file download instantly. Is that possible?
Yes...Downloads purchased via zencart..email link is not sent,
but purchaser able to view/download when they login, or immediately
after successful checkout/payment.

See
https://www.zen-cart.com/tutorials/index.php?article=71

But is there any way to have the download link be the first thing they see after payment?

When they return to the checkout success page, you could shift the section "<!--bof -product downloads module-->" upwards, in the file:-includes/templates/template_default/templates/tpl_checkout_success_default.php .

Remember to save the edited file to your over-rides folder...

includes/templates/your_template/templates/tpl_checkout_success_default.php