I'm not sure then. You can try making a new C# Universal Windows app to see if fixes the issue. Copy the xaml and C# files and add the MetaWear.WinRT package from NuGet.
Alternatively, you can see if the UWP starter template works for you.
No, those are the only two vs solutions we have. I get that you are having issues importing the sample code but, can you create a "hello world" C# universal Windows app? If so, then I'd start there and copy bits and pieces of the netawear code over.
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PlayList
https://www.youtube.com/playlist?list=PLiiW3P34smqYTIcxTMMgsZ0HLEJSGmkDs
Source Code
https://github.com/mbientlab-projects/MetaWearTutorial-UWP