Download CSD 2016
If you already have CSD 2016 installed, the easiest way to update your software and database is to go to the Help->Check for Updates menu item in Mercury or Hermes. This will determine what updates are available, then download and apply the update automatically. Users of Windows 7 and above will need to right-click on Mercury or Hermes, select 'run as administrator' and then follow this procedure.
If you really, really need to download the software and database update manually, you can do so.