Files Left: 4
 

I'm not to sure as to what's going on but EQ2MAP stops and says 4 files left. I then get the following messege:

Unknown Error: mscorlib
at System.IO.__Error.WinIOError(Int32 errorCode, String str)
at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)
at System.Security.Cryptography.HashAlgorithm.ComputeHash(Stream inputStream)
at WindowsApplication7.Form1.GetFileMD5(String FilePath)
at WindowsApplication7.Form1.DownloadExtras()
at WindowsApplication7.Form1.DoUpdates()
at WindowsApplication7.Form1.Timer3_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.Callback(IntPtr hWnd, Int32 msg, IntPtr idEvent, IntPtr dwTime)Data error (cyclic redundancy check).

I reloaded .NET 1.1 and the fix. no help at all

If I shut down EQ2MAP and run EQ2 I can get al the way in, but then the EQ2 Client crashes. Reloading EQ2 now to see if it helps.

from th elooks of it something is causing the data for those files to become corrupted, it could be your connection or hard drive. if you have another hard drive try updating to that to see if it fixes the problem.

Good call
May also be related to system RAM as well I believe.
Always a possibility of another application conficting with shared memory banks or worse bad memory...
Have you tried closing all possible applications before launching EQ2Map Updater?