to your account. You must have a registered Fortinet product or a partner account. Navigate to Support > Firmware Download . Select FortiGate as the Product. Go to the Download tab and navigate through the directory: v7.00 > 7.4 > 7.4.7
After downloading the fgt_vm64_kvm-v7.4.7.m-build2731-fortinet.out.kvm.qcow2 image: to your account