You download ProVide Gateway from inside the ProVide administration interface, not from the website. You need a running ProVide Server first, either a trial or an active license, because Gateway runs in front of ProVide and is managed from the same admin area. Once ProVide is running, open the admin area, download the Gateway installer for Windows or Linux, and install it. You then connect Gateway to your ProVide Server and activate its license key in the same place.