We have noticed that the download functionality returns an empty shapefile when you choose "shapefile" as data format during the download operation. We are making every effort to fix the issue and let you know when it's fixed. This issue has happened since October 2015.
Other data formats such as CSV work fine.
If you need a shapefile sooner than later, let us know your criteria. We will manually generate a shapefile for you. If you experienced the issue in the past and still want to obtain a shapefile, please give us your name, date you tried to download and criteria (e.g. which species?) etc.
Thank you for being patient.