WXSimMate 6.3 errors today, will not run

Unchecking the MOS GFS checkbox allowed wxsimate program to open, but when I clicked download files, Norton security pops up a firewall alert saying wxsimate.exe does not have a valid digital signature. When I left the Norton window up to copy what I saw here, another unhandled exception error pops up reading:
"Could not find a part of the path ‘c:\wxbig'data.txt’.
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.IO.DirectoryNotFoundException: Could not find a part of the path ‘c:\wxbig'data.txt’.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.File.Open(String path, FileMode mode)
at wxsimate.Form1.makefile()
at wxsimate.Form1.downloader()
at wxsimate.Form1.downld_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8794 (WinRelRS2.050727-8700)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll

wxsimate
Assembly Version: 1.0.6402.29278
Win32 Version: 1.0.6402.29278
CodeBase: file:///C:/wxsim/wxsimate.exe

System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8800 (WinRelRS2.050727-8800)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

Microsoft.VisualBasic
Assembly Version: 8.0.0.0
Win32 Version: 8.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/Microsoft.VisualBasic/8.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll

CustomMarshalers
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/CustomMarshalers/2.0.0.0__b03f5f7f11d50a3a/CustomMarshalers.dll

System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8784 (WinRel.050727-8700)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box."