This is a significant behavior change. From Vijeo Designer 6.2 SP10 onwards, Ethernet-based project downloads to the HMI are disabled by default for security reasons. When using SP12, if you cannot transfer your project via Ethernet, you must manually enable this feature in the HMI's configuration settings (e.g., on a Magelis HMIGTO unit).
You can check your exact build number by opening Vijeo Designer and navigating to Help -> About Vijeo Designer . It will display the full version string (e.g., 6.2.12.2054). vijeo designer 62 sp12 hotfix