Created Unassigned: NuGet Package Manager Instatll Error - File contains corrupted data. [27733]

I tried installing this through the NuGet Package Manager and I am getting a "File contains corrupted data" error and through the Package Manager Console:

PM> Install-Package AjaxControlToolkit
Attempting to resolve dependency 'AjaxMin (≥ 4.97.4951.28483)'.
Attempting to resolve dependency 'HtmlAgilityPack (≥ 1.4.6)'.
Install-Package : File contains corrupted data.
At line:1 char:16
+ Install-Package <<<< AjaxControlToolkit
+ CategoryInfo : NotSpecified: (:) [Install-Package], FileFormatException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

Am I doing something wrong or what do I need to do to correct this. I even tried creating a new blank project and installing but still got the same error so I don't think it's my actual VS solution.

Thanks