I've got the same issue as well, so I figured I'd post here rather than make another post.
To make sure it wasn't a compatibility issue I downloaded another RO client from another server theirs worked just fine without any alterations yet with fkenro client no matter what compatibility mode, run as admin, uninstalling my runtimes and getting them again allowing every .exe from the ForsakenRO folder into my Bitdefender, even went as far as downloading the latest kro client on its own and just get the Forsaken RO files to add to them, absolutely nothing would make it boot no matter what config I tried in setup.exe etc, starting to think it isn't even RO related but rather gpard itself.