latest MixedReality250-master unity project has thousands compile error

hello Microsoft

i just download the latest version of Mixed Reality 250 excise file (https://github.com/Microsoft/MixedReality250/archive/master.zip)

and open the Asset in Unity 2017.1.0f3, but found lots of compile error, most of them are complaining about some XR to VR namespace issue, I tried to change the XR to be VR but found lots of new method existing in XR not working in VR namespace

example:
using UnityEngine.XR.WSA.Input; // has compile error
InteractionManager.InteractionSourceLost += InteractionManager_OnSourceLost; // compile error

the whole project is not working for latest Unity

what should I do?

can you help me?

thanks