Detected package downgrade warning (dotnet core, vs 2017)

Question

I have just updated all my nuget packages for my solution (dotnet core 1.1 project).

I am now getting the following warnings and I don\'t really know what they mean.

Answer 1

I could solve the problem by downloading earlier version of the package causing the problem, that seems to be caused by depending on a .NET Standard version that's not installed, this also should be solved by updating Visual Studio.