I see this error in VS2015 after having installed Xamarin and the SDK for Native Xamarin Apps:
Unable to resolve dependencies. 'Xamarin.Android.Support.Design 24.2.1' is not compatible with 'Xamarin.Forms 2.3.2.127 constraint: Xamarin.Android.Support.Design (= 23.3.0)'.
How do I install the newer version of Xamarin.Android.Support.Design?