A DirectX 9 game is recognised as one, instead of being treated as DX12. Aion renders through XRenderD3D9.dll and loads the system d3d9.dll by name, so the API read came back "unknown, assume DirectX 12" and the tool installed a dxgi.dll the game never asks for — everything reported success, ReShade never loaded, and no ReShade.log was ever written (#16).
D3D9 is now detected from the exe's imports and from the engine DLL that actually holds the renderer, which is where it shows in games like this one. The install is refused with the reason: DLSS needs a Direct3D 11 or 12 device, D3D9 never creates one, and the route that works is dgVoodoo 2.87.3 in front — it turns D3D9 into D3D11, and everything else follows from there.
The game list shows these as DirectX 9 rather than "DirectX 12?".