.NET Blazor Build error

I have tried to run the out of the box Blazor application to try out C# WebAssembly. I am running into issues when trying to run it different ways. I have also tried to hack the runtimeconfig.json according to this https://github.com/dotnet/cli/issues/7543

Running IIS Express

Running BlazorApplication1 The program '[42032] dotnet.exe' has exited with code -2147450749 (0x80008083).

Running in command line It was not possible to find any compatible framework version The specified framework 'Microsoft.NETCore.App', version '2.0.0-preview3-25512-01' was not found. - Check application dependencies and target a framework version installed at: \ - Alternatively, install the framework version '2.0.0-preview3-25512-01'.

You need to have the 2.1 preview of the .net core framework installed for Blazor to work: download here