FTPClient.cs

using FluentFTP;

namespace IRCFTPTing
{
	class FTPClient
	{
		FtpClient client = null;

		public FtpClient getConnection()
		{
			if (client == null)
			{
				client = new FtpClient("host", 21, "user", "passwd");
			}
			if (!client.IsConnected)
			{
				client.Connect();
			}
			return client; 
		}

	}
}

FTPIRCThing.cs

using FluentFTP;
using Meebey.SmartIrc4net;
using System;
using System.IO;

namespace IRCFTPTing
{
	class FTPIRCThing
	{
		FTPClient ftp = new FTPClient();

		public void Start()
		{
			IrcClient irc = new IrcClient();
			irc.OnChannelMessage += new IrcEventHandler(OnChanMsg);
			try
			{
				irc.Connect("chat.freenode", 6667);
			}
			catch (Exception ex)
			{
				Console.WriteLine("1 Unable to connect to IRC server: {0}", ex.Message);
			}
			try
			{
				irc.Login("HdndAutoDL", "HdndAutoDL");
				irc.RfcJoin("#random");
				irc.Listen();
			}
			catch (Exception ex)
			{
				Console.WriteLine("2 Unable to connect to IRC server: {0}", ex.Message);
			}
		}

		private void OnChanMsg(object sender, IrcEventArgs e)
		{	
			string releaseName = e.Data.Message;
			string dst = $"C:\\Users\\Hidend\\Documents\\{releaseName}";
			string src = $"/{releaseName}/";
			downloadRecursively(ftp.getConnection(), src, dst);
		}

		private void downloadRecursively(FtpClient client, string src, string dest)
		{
			int count = 0;
			foreach (FtpListItem item in client.GetListing(src))
			{
				count++;
				Console.WriteLine(item.Name);
				if (item.Type == FtpFileSystemObjectType.Directory)
				{
					System.IO.Directory.CreateDirectory(Path.Combine(dest, item.Name));
					downloadRecursively(client, Path.Combine(src, item.Name), Path.Combine(dest, item.Name));
				}
				else if (item.Type == FtpFileSystemObjectType.File)
				{
					client.DownloadFile(Path.Combine(dest, item.Name), item.FullName);
				}
			}
		}
	}
}

Program.cs

namespace IRCFTPTing
{
	class Program
	{
		static void Main(string[] args)
		{
			FTPIRCThing fTPIRCThing = new FTPIRCThing();
			fTPIRCThing.Start();
		}
	}
}