Build API - Download Package Function

Hi, 

I m trying to build an deployment helper in mendix using the REST APIs given by MENDIX.

I m facing issue for a particular fucntion i.e download function.After hitting the services for the downloading the package ,  I m unable to find the attachment in the SOAP - UI. Also i m not sure how will I implement this in the MENDIX for the DOWNLOAD of the file . Could anyone help me in this?