Upgrading from "1.0.0-rc2-3002702" to "1.0.0"

Hi,

I want to upgrade my netcoreapp from "Microsoft.NETCore.App": "1.0.0-rc2-3002702" to "Microsoft.NETCore.App":"1.0.0". Here is what I did,

PM> install-package Microsoft.NETCore.App
  GET https://api.nuget.org/v3/registration1-gz/microsoft.netcore.app/index.json
  OK https://api.nuget.org/v3/registration1-gz/microsoft.netcore.app/index.json 2011ms
Retrieving package 'Microsoft.NETCore.App 1.0.0' from 'nuget.org'.
Installing NuGet package Microsoft.NETCore.App.1.0.0.
Successfully installed 'Microsoft.NETCore.App 1.0.0' to testing
Executing nuget actions took 658.4 ms
Time Elapsed: 00:00:08.5324267

it looks fine. I double check "References" => ".NETCoreApp,Version=v1.0" => "Microsoft.NETCore.App(1.0.0)". So it's been updated.  However, when I did add-migration

PM> add-migration study
The targeted framework { 'Microsoft.NETCore.App': '1.0.0' } was not found.   
- Check application dependencies and target a framework version installed at:
       C:\Program Files (x86)\dotnet\shared\Microsoft.NETCore.App 
  - The following versions are installed:
       1.0.0-rc2-3002702 
   - Alternatively, install the framework version '1.0.0'.

This confuses me. I have two questions:

1.The nugget package 'Microsoft.NETCore.App 1.0.0' has been installed to my local project named "testing", isn't this enough?

2.My current version in "C:\Program Files (x86)\dotnet\shared\Microsoft.NETCore.App" is "1.0.0-rc2-3002702". Do I need to update it also? This isn't bound to any specific .netcoreapp project, how do I upgrade it?