Select the Assignments tool from the Tool Menu of your site.
You may choose "All" to select all of the download options, or select only some of them by placing a check mark next to an individual item or items. The options available for download are:
Click the Download button to save the files your computer.
Extract the archive to a location on your computer. (You can do this by right-clicking on the file and selecting Extract All in Windows, or by using your preferred unzipping program on your computer.)