Have you actually updated DirectX then? I don't see any of that in your posts. Graphics drivers never affect the DX version. What you actually have not done is exactly what the message says. Please download and install the DirectX End-User Runtime, then restart the game.

Furthermore, it kind of baffles me why a "developer" would miss something so simple and is using a server (on which you supposedly run your core business) as a gaming device and do not have it running as a VM, increasing safety and scalability.