Hello Lance,
For any encrypted sample set (which would include any dongle-licensed sample set), you need to install the Hauptwerk v5+ compatible version, since v5+ can't read v4 encrypted sample sets, due to the change of licensing system. For the download links for the v5+ versions of MDA and Paramount sample sets please see here:
viewtopic.php?f=10&t=17988
(For those from any other producers, please check with their makers if applicable.)