Trouble with URP when implementing Application Spacewarp

Following this guide https://developer.oculus.com/blog/introducing-application-spacewarp/

I am trying to use Application Spaceawarp (AS) in my project.

From the guide it is unclear to my how you should exactly replace the URP pipeline. What I did (unsuccesfully): 

delete the current URP package from my project

place the folder com.unity.render-pipelines.universal from that branch into my assets folder. 

What happens is that I get compilation errors for scripts inside com.unity.render-pipelines.universal, it is missing a bunch of stuff. 

(for example: Assets/com.unity.render-pipelines.universal/ShaderLibrary/ShaderTypes.cs(5,10): error CS0246: The type or namespace name 'GenerateHLSLAttribute' could not be found (are you missing a using directive or an assembly reference?))

When I include the URP package from the package manager, I get the message that there are duplicates. 

(for eaxmple: Assembly with name 'Unity.RenderPipelines.Universal.Runtime.Tests' already exists (Assets/com.unity.render-pipelines.universal/Tests/Runtime/Unity.RenderPipelines.Universal.Runtime.Tests.asmdef) ) 

Advice is appreciated 🙂