Errors compling NVRTX 5.3 Build

Trying to build the NVRTX 5.3 branch. When running GenerateProjectFiles.bat I get the following. Looking for help on how to resolve:

Generating VisualStudio project files:

D:\UE-nvrtx-5.3.1-1\Engine\Source\Developer\Windows\ShaderFormatD3D\ShaderFormatD3D.Build.cs(31,41): error CS0103: The name ‘DirectX’ does not exist in the current context
D:\UE-nvrtx-5.3.1-1\Engine\Plugins\Media\ElectraUtil\Source\ElectraSamples\ElectraSamples.Build.cs(49,8): error CS0103: The name ‘DirectX’ does not exist in the current context
D:\UE-nvrtx-5.3.1-1\Engine\Plugins\Media\ElectraCodecs\Source\ElectraDecoders\ElectraDecoders.Build.cs(60,7): error CS0103: The name ‘DirectX’ does not exist in the current context
D:\UE-nvrtx-5.3.1-1\Engine\Plugins\Media\ElectraPlayer\Source\ElectraPlayerRuntime\ElectraPlayerRuntime.Build.cs(57,7): error CS0103: The name ‘DirectX’ does not exist in the current context
D:\UE-nvrtx-5.3.1-1\Engine\Source\Programs\ShaderCompileWorker\ShaderCompileWorker.Build.cs(31,28): error CS0103: The name ‘DirectX’ does not exist in the current context
Expecting to find a type to be declared in a target rules named ‘AutoRTFMTestsTarget’. This type must derive from the ‘TargetRules’ type defined by Unreal Build Tool.

GenerateProjectFiles ERROR: UnrealBuildTool was unable to generate project files.

Did you run the setup.bat first?