Install dotnet core version 1.1 runtime

I currently have dotnet core version 2 installed on my Fedora box, dotnet --version returns 2.0.0 as expected.

When I run an existing project targeting netcoreapp1.1 with dotnet run I get:

It was not possible to find any compatible framework version
The specified framework 'Microsoft.NETCore.App', version '1.1.2' was not found.
  - Check application dependencies and target a framework version installed at:
      /
  - Alternatively, install the framework version '1.1.2'.

(Note that dotnet build completes successfully on the project)

How do I install framework version runtime 1.1.2 with the current sdk (2.0.0), where dotnet run will work correctly with both new projects and projects targeting runtime 1.1.2?

In my neivity, I downloaded the 1.1.2 runtime and copied the 1.1.2 folder into my /usr/share/dotnet/shared/Microsoft.NETCore.App folder and have been rewarded with Failed to initialize CoreCLR, HRESULT: 0x80131500 when I run dotnet run... but I knew that wasn't how to do it before I even started.

As a side note, my Windows box has dotnet sdk 2, and runs the project fine... but that was all setup with Visual Studio black magic.