You can download a VPN-only FortiClient (iOS) app. This app is free, supports basic SSL VPN, and does not require registration with EMS. This version does not include central management, technical support, or some advanced features such as always up, autoconnect, and so on.
Full-featured FortiClient (iOS) requires registration to EMS. Each endpoint registered with EMS requires a license seat on EMS.
When you launch the free VPN-only FortiClient (iOS) for the first time, it requests permissions to use the camera and access storage. Grant permissions as required. Only the VPN feature is available. Configuring settings for a new VPN connection on the free VPN-only FortiClient (iOS) resembles doing the same on the full-featured FortiClient (iOS). See SSL VPN for details.