Visual Studio Nuget manager does not show OpenTK package-CodePudding

I am trying to add OpenTK as a dependency. When I open the Nuget Package Manager, the only Package source displayed is "Microsoft Visual Studio Offline Packages", so I went to Tools > Options > Nuget Package Manager > Package Sources and added the package source:

Name: nuget.org
Source:

CodePudding user response：

As a solution to installing packages that do not show up on the Nuget manager GUI, I can use the Package Manager Console which finds OpenTK without problem.
```
PM> Install-Package OpenTK
```
CodePudding user response：

Maybe this is the package you need:

You can check if your scroll wheel is on the top and if there is any package you missed