The download links issued for orders that include downloadable product are good for several tries over a three-day period.
If you are unsure whether a link is still good, try it. You will receive an informative message if it has expired.
Call or leave a support ticket requesting a new link, and one will be issued promptly.
BE SURE to include the ORDER NUMBER to which the link was attached. Our order numbers begin with HPP-.....
Also, please leave contact information if we need to respond other than issuing a new link.
See also this article on how to get downloads: http://www.makeadifference.com/Support/help/index.php?action=kb&article=32