The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found

Question

I tried to upgrade my web app from .net core 2.0 to .net core 2.1 I did:

1) Install Visual Studio Professional 2017 Preview Version 15.8.0 Preview 1.1
2) Install

Answer 1

.NET Core 2.1 SDK will be released this week. If you can't wait until then, add this to your *.csproj

  
    netcoreapp2.1
    
        https://dotnetfeed.blob.core.windows.net/orchestrated-release-2-1/20180515-07/final/index.json
    
  
  
  ....

And download the final SDK from: https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300/dotnet-sdk-2.1.300-win-x64.exe

For more details visit: https://github.com/aspnet/Home/wiki/2.1.0-Early-Access-Downloads