Email Download Link Before Payment :-)

Hi everybody,
Has anyone know of an extension like this:

I want to sell some downloadable files, but I first want the customer to download the files for free and if satisfied, comes to a payment page and pay for it. Due to some certain reasons, I need to send the download links to the customer's email. So here is what I need:
I want to change the "Add to cart" button to "Send me the links" button. The customer clicks on it and receives the download link in his/her email for free. The email also contains another link for payment. If the customer is satisfied with the files, he/she clicks on this link and comes to the cart page, where the product is already added to the cart.

Thanks in advance for any help.

Well, you could use one of the Extensions, mentioned on this german-language Page
I just wrote a short while ago. It's all about buy now - pay later, kind of.
Good Luck
Ernie
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And if you cannot read german language, Google Translate can !
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