install-package Visual Studio "Dependecy Loop Detected"

I wanted to reference an old version of newtonsoft.json to my project but package manager is telling my there is a 'loop'. I have already uninstalled newtonsoft.json and it confirms that I no longer have it.

Dependecy Loop

Edit: I have 2 projects in my solution. I want add an older version of 9.0 in Project B.

Project A references Newtonsoft.Json 9.0

Project B references Project A

Update 2: The Package manager UI gives me the latest one that is why I am trying to use the console.

Can anyone share some light to what really is happening here? Thanks!

In VS,go Tools=>Options=>Package Manager(Nuget Package Manager)=>Package Source to check your available package source, make sure you've configured and enabled Nuget.org(v3) there, if not, configure it manually to add it as package source.

Then in package manager I suggest you can use command Install-Package NewtonSoft.json -Version 9.0.1 to install the package current project.

If you still get the Dependency Loop error message, assuming you have three project in the solution, A depends on B, B depends on C. And B is the project you want to install Newtonsoft 9.0.1 package, check if A have a nuget package requires higher version than 9.0.1, or if C have a package requires higher version than 9.0.1.