From In-Portal User Manual

 'Export' button (globe icon with a green arrow pointing out) allows the administrator to export a pack into a file. The file is first saved on the web server, and then it can be downloaded onto the workstation. The first field to enter is the file name. The full path is shown to the left of the file name input field. Please ensure that this directory is writable to the web server, otherwise the export will fail. Once the export is done, it will provide you with a link to download the file, or an error message, if the export failed.