If you already have a legitimate Fortinet license, I can help with this image on KVM (libvirt, virt-manager, or direct QEMU commands). Let me know what your actual goal is.
This specific file, fgt-vm64-kvm-v7.2.3.f-build1262-fortinet.out.kvm.qcow2 , is the image for the KVM hypervisor, running FortiOS version 7.2.3, build 1262. Download and Access Instructions If you already have a legitimate Fortinet license,
Look for FGT_VM64_KVM-v7.2.3.F-build1262-FORTINET.out.kvm.zip . running FortiOS version 7.2.3