Hi
Right now, the extension doesn't have re-send download link feature yet. So the solution is that :
1. You ask your customer to register for an account on your site .
2. You assign the order to his account (if he register for the account using the same email he uses to purchase the document, the order will be associated to his account automatically and you don't have to assign it) .
3. You create a menu item to link to My Docs (My Purchased Documents) view of Documents seller (title of this menu item can be called something like Orders History) . Customers can click on this menu item to see their orders history and download the purchased documents .
I will consider implementing re-send confirmation email in the next release .
Regards,
Tuan