You can download a CSV file of your Ad Hoc users and preregistrations data from the Manage Ad Hoc Users section.
Please note: The name of this area can be set by your company, so this tab may be named as something other than Manage Ad Hoc Users.
Download your data by clicking the grey Download button found in the top right corner in the ad hoc sections available to you.
Your CSV file will automatically start to download to your default download directory, once the Download button has been clicked.