That indicates the Remote Product File URL you have configured in that product's settings failed to respond when we contacted it, so we simply served a copy we retained of the last file downloaded for that product. This help page section explains more about how our Remotely Hosted Downloads feature works, to give you a clearer idea of what's going on there:
If you're getting that notification for every download link issued for that product, there may be a problem with the URL itself. To test it, copy that URL out of the product's settings, and paste it directly into your browser's address bar to see if that will start a download.
If you only get that notification once for a product, but subsequent links issued for the same product did not also generate the notification, then there was probably just a temporary connectivity glitch that prevented our server from being able to contact your file hosting server at that moment, which has since cleared up.