Click on the "Progress" link from within a sample
The "Progress" screen is where you're able to view the progress of an assessment taking place. For a detailed description of the "Progress" area please see: Viewing Assessment Progress
Go to "Download Assessments"
"Download Assessment" allows you to export a customized CSV or JSON. Once the options needed are selected, the file can be easily downloaded by clicking the "Generate..." button at the bottom of the screen.