Check Adobe Reader is installed (C#)?

by 
using System;
using Microsoft.Win32;

namespace MyApp
{
    class Program
    {
        static void Main(string[] args)
        {
            RegistryKey adobe = Registry.LocalMachine.OpenSubKey("Software").OpenSubKey("Adobe");
            if(null == adobe)
            {
                var policies = Registry.LocalMachine.OpenSubKey("Software").OpenSubKey("Policies");
                if (null == policies)
                    return;
                adobe = policies.OpenSubKey("Adobe");
            }
            if (adobe != null)
            {
                RegistryKey acroRead = adobe.OpenSubKey("Acrobat Reader");
                if (acroRead != null)
                {
                    string[] acroReadVersions = acroRead.GetSubKeyNames();
                    Console.WriteLine("The following version(s) of Acrobat Reader are installed: ");
                    foreach (string versionNumber in acroReadVersions)
                    {
                        Console.WriteLine(versionNumber);
                    }
                }
            }
        }
    }
}

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