Login to your Blackboard, open Grade Center. Then locate an assignment, click on the double-down arrow next to the assignment title and select Assignment File Download.
Select the students' name by checking the checkboxes next to the students. To select all, check the very first checkbox next to Name.
Click Submit.

On the Download Assignment page, click on Download assignments now link. This link also shows you the file size (e.g., 24KB).
Click Save to save the file to your local drive.
Choose a location to save the file and click on Save button.

The assignments are downloaded as a zipped file.

You will need to right click on this file and choose Extract All to unzip the file before you view the assignments.