1. Refer the Menu Invocation attachment and create a Menu with the same name.
2. Download the attached downloadAll.html and save it under <SupportCenter\integration\resources> folder.
3. Now open a request which has attachments and click on the DownloadAllattachments Menu present under settings icon.
It will download all the attachments present in the ticket.
You don't have to shut down and start the application while doing this operation.
PS : You can add your logic for storing the attachment in a NAS or under any shared folder.