>I understand that you would like your customers to receive an email with the downloadable file after purchase, is this correct?
>This will ensure that a link to the downloadable product will be immediately available after purchase, as well as an email with the downloadable link sent to the customer.
I need the buyer to receive not a link to the file, but the file itself. A letter with an attached attachment in the form of a file that the buyer has paid for. Or several files if more than one was paid for.