Fatal error E_INVALIDARG

I have Windows 10 - Direct X 12 - i7 - 16 GB RAM - GTX 970 M and UE 4.19.2
Bought landscape pack frome some Gokhan Karadayi on Unreal Marketplace.
Everytime I try to load one of the maps, UE crashs directly or during compiling shader:
How can I fix this?
This Gökhan doesn’t answer or only after weeks, so he is sellling his overpriced stuff and it doesnt work…

Fatal error: [File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Util.cpp] [Line: 242] (Device->*TPSOFunctionMap::GetCreatePipelineState())(Desc, IID_PPV_ARGS(&PSO)) failed at D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\D3D12RHI\Private\Windows\WindowsD3D12PipelineState.cpp:601 with error E_INVALIDARG