I have updated to dotnet core and vs 2015 update 3 using the installers in the link below.
https://www.microsoft.com/net/core#windows
After restarting my PC and opening VS I get a compiler error
Version for package `Microsoft.AspNetCore.Razor.Tools` could not be resolved C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DotNet\Microsoft.DotNet.Common.Targets 262 5