For administrators within a program, reports are easily accessible within a sample.
Navigate to your sample and click on the "Progress" link
Go to "Download Assessments"
"Download Assessment" allows you to export a customized CSV or JSON. Once the option's needed are selected, the file can be easily downloaded by clicking the "Generate..." button at the bottom of the screen. For a more in-depth look at this please go to the article What are the Program Assessment Report Options?