Vulkan games work again on the OptiScaler engine. The refusal added in 0.11.8 disabled Install for every Vulkan game, including ones that were working before — Indiana Jones and the Great Circle among them (#46). Only the ReShade engine cannot reach Vulkan, because it hooks through a dxgi.dll a Vulkan game never loads. OptiScaler covers Vulkan perfectly well, so the refusal now applies to that one engine and the game installs as it used to.
RE Engine games get the settings that stop them crashing. Dragon's Dogma 2 crashed at startup on Capcom's own handler, and after that silently closed the moment the intro handed over to the 3D menu (#44). Install now writes four OptiScaler settings for any RE Engine game:
[Hotfix]
ManualInputPolling=true ; stop fighting REFramework over WndProc
RestoreComputeSignature=true ; RE Engine's scheduler asserts without it
RestoreGraphicSignature=false ; must stay off
ExtendedStateRestore=false ; must stay off
The last two are the important ones: with them on, OptiScaler restores graphics root state that the swapchain rebuild after the intro has already invalidated, and the dangling descriptors kill the NVIDIA driver (nvwgf2umx.dll, 0xC0000005). Credit to @zeydsama, who ran the crashes down to exactly these four settings.