You may wish to give a free copy of your file to a friend or perhaps as a trade, barter or refund to someone.
You can use a manual transaction to produce a download link, this creates a transaction that has been approved for downloading.
In the "Create New Transaction" dialog box, select the file you would like to give away from the drop down list and then hit "Create".
You will be presented with a screen containing the newly generated reference code as well as a link, simply cut and paste the link (or use your browsers "Copy Link Location" function) to collect the newly generated link.
Give the link to whomever you wish, and they will be able to download the file just as if they paid for it (including the download count and time restrictions)