Coupons and downloadable files

Hi,

I am trying to get this to work but to no avail.

I basically have downloadable products, (video files) that need to only be available once paid for. This works fine. However my client also requires a coupon that gives 100% off a single product.

When I test this, the discount is applied to the whole order, (so if you add more than 1 product, and then apply the coupon you get 100% of the order free, not just the 1 product as needed) and also because the order is free you do not go to PayPal, it just says 'Thanks for your purchase' and then you receive a created order email, but no email with the file link.

I have read another post on this matter, but setting the regsitration to simplified registration did not work for me.

Any ideas?

Many thanks