Digitize N stitch will allow you to use "Save As" option to save designs in many common embroidery file format Including HUS .Please try the Trial version as well to find out if this software is compatible with your system.
If this does not resolve your issue, please feel free to send us an e-mail at support@annthegran.com. Our email support hours are Monday to Friday 9am to 5pm Eastern Standard Time, and Saturdays 10am - 6pm.