Nuget not installing packages

Goal

My goal is to simply install a package via NuGet Package Manager.

I decided to delete Visual Studio 2019 and re-install it. Hoping it'll solve my issue. Then, I created a new project - tried downloading a Newtonsoft.Json package and same errors are displayed.

Error

Severity    Code    Description Project File    Line    Suppression StateError       The feed 'nuget.org [https://api.nuget.org/v3/index.json]' lists package 'Newtonsoft.Json.13.0.1' but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again.Unable to find package 'Newtonsoft.Json.13.0.1'.                

What I tried

I tried the following solution: https://stackoverflow.com/a/52327750/12485722

It displays the same error again.

Also, have tried to install another package such as Microsoft.Extensions.DependencyInjection

I then took a look into the Output and this is displayed:

  GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json  OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json 199ms  GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg  OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg 1ms  GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg  OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg 96ms  GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg  OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/13.0.1/newtonsoft.json.13.0.1.nupkg 96ms  GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json  OK https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json 498ms  CACHE https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.json  CACHE https://api.nuget.org/v3-flatcontainer/newtonsoft.json/index.jsonThe feed 'nuget.org [https://api.nuget.org/v3/index.json]' lists package 'Newtonsoft.Json.13.0.1' but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again.  Unable to find package 'Newtonsoft.Json.13.0.1'.Time Elapsed: 00:00:00.9643895

I also followed steps from the Microsoft website (Quick solution for Visual Studio users) : https://docs.microsoft.com/en-us/nuget/consume-packages/package-restore-troubleshooting

Nothing changed.

Why is my NuGet Packages not installing?

NuGet.Config

This is how my NuGet.Config looks like. Found in C:\Users\SomeUser\AppData\Roaming\NuGet.

<?xml version="1.0" encoding="utf-8"?><configuration><packageSources><add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" /></packageSources></configuration>