Fortinet signs firmware with GPG keys. Advanced users can import Fortinet’s public key and verify:
If you are looking for the official, verified download of the (specifically the 64-bit image package containing the .qcow2 file), the safest method is through the official Fortinet Support Portal. fgtvm64kvmv6build1010fortinetoutkvmqcow2 download verified
Choose FortiGate as the product and KVM as the platform. Fortinet signs firmware with GPG keys
Once extracted, the .qcow2 file can be imported into your KVM environment: fgtvm64kvmv6build1010fortinetoutkvmqcow2 download verified
This is not a standard public download name from Fortinet’s official support site. It may be: