For non-library Twilio issues, please check the Twilio Support Help Center first, and file a support ticket if you don't find an answer to your question.
If you can't find a solution below, please open an issue.
If you require a different version of Json.NET than what this helper library specifies, you can enable binding redirection (automatic or manual) or utilize this quick fix for existing projects:
In Visual Studio, open the Package Manager Console (Tools... NuGet Package Manager... Package Manager Console) and run the following command: Get-Project –All | Add-BindingRedirect