I got an error in the updating process of the NuGet Package. I searched over the internet and it suggests me about the Package Manager Setting then update the package by selecting from the Package Source. I tried this process but that didn't work.
This is the error:
An error occurred while trying to restore packages: Unable to find version '2018.2.620' of package 'Telerik.UI.for.AspNet.Mvc5'.
C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\:Package 'Telarik.UI.for.AspNet.Mvc5.2018.2.620' is not found on source 'C:\Program Files (x86)\Microsoft SDKs\NugetPackages\'.
https://api.nuget.org/v3/index.json: Package 'Telarik.UI.for.AspNet.Mvc52018.2.620' is not found on source 'https://api.nuget.org/v3/index.json'.
https://nuget.telerik.com/nuget: Failed to fetch results from V2 feed at 'https://nuget.telerik.com/nuget/Packages(Id='Telerik.UI.for.AspNetMvc5', Version=.2018.2.620') with following message : Response status code does not indicate success: 401 (Logon failed).