Trial License Activation via COM API

C# - start trial

using iSpring;
using System;

namespace activateSampleCSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            IPresentationConverter converter = new PresentationConverter();
            ILicenseManager licenseManager = converter.LicenseManager;
            try
            {
                licenseManager.LicenseKey = "NPS3H-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX";
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

            Console.WriteLine("Trial period days left : " + licenseManager.DaysLeft);
        }
    }
}