I installed .NET Core 1.0 official installer released yesterday using this pkg (https://go.microsoft.com/fwlink/?LinkID=809124).
dotnet-dev-osx-x64.1.0.0-preview2-003121.pkg

Version: 1.0.0-preview2-003121