To download all students' submissions from a Ted assignment:
Go to your class's Full Grade Center by clicking the
arrows that follow Grade Center in the Control Panel. 
From the
button's drop-down menu in the column header, select Assignment File Download.

A list of your class's students will be displayed, with a checkbox next to each student who has submitted an assignment. First, make sure that all students are showing by clicking the Show All button below the class list, if one is present.

To select all students, put a check in the checkbox in the header of the table showing the students' names. ClickSubmit to continue.

Ted will then package all your assignments into a zip file, and display a link. Click the link to download the files.

The Zip file will contain one or more for each files for each attempt made by each student. For example, if Alfred Nobel (username anobel) submitted to the assignment "Midterm" at 5:30:59PM on 8/19/2011 with two files attached, Midterm.docx and Abstract.docx, the following files would be included: