Android:
https://play.google.com/store/apps/details?id=com.fortinet.forticlient_vpn

iOS:
https://apps.apple.com/us/app/forticlient-vpn/id1475674905

Other:
https://filestore.fortinet.com/forticlient/downloads/FortiClientVPNInstaller.exe
https://filestore.fortinet.com/forticlient/downloads/FortiClientVPN_7.4.3.4323_OnlineInstaller.dmg
https://filestore.fortinet.com/forticlient/downloads/forticlient_vpn_7.4.3.5411_x86_64.rpm
https://filestore.fortinet.com/forticlient/downloads/FortiClientVPNInstaller_arm64.exe
https://filestore.fortinet.com/forticlient/downloads/forticlient_vpn_7.4.3.5411_aarch64.rpm
https://filestore.fortinet.com/forticlient/downloads/forticlient_vpn_7.4.3.5411_arm64.deb
https://filestore.fortinet.com/forticlient/downloads/forticlient_vpn_7.4.3.5411_amd64.deb