NuGet add reference error while installing package

I am not able to install any package by Nuget.

Install-Package MyToolkit.Extended

Attempting to resolve dependency 'MyToolkit (≥ 2.2.3.0)'.
Attempting to resolve dependency 'Microsoft.Bcl.Async (≥ 1.0.166)'.
Install-Package : The 'Microsoft.Bcl.Async 1.0.168' package requires NuGet clint version '2.8.1' or above, but the current NuGet 
version is '2.7.40911.287'.
At line:1 char:1
+ Install-Package MyToolkit.Extended
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [Install-Package],       NuGetVersionNotSatisfiedException
 + FullyQualifiedErrorId :    NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

Solution

According to the error message you got, I'd suggest to check and update your NuGet Visual Studio Extension (Tools > Extenstions and Update) before installing the library package.

Note: Restart visual studio after updating Nuget VS extension and before downloading your library package.