Error when saving Settings File for Workflow Install

I'm trying to use the "Save My Settings to File" button on the "System Check" page of the installer for Workflow itself.

It keeps generating the following error:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentNullException: String reference not set to an instance of a String.
Parameter name: s
   at System.Text.Encoding.GetBytes(String s)
   at Symantec.Workflow.Installer.Core.WebConfiguration.WebConfigurationProvider.Encrypt(String clearText)
   at Symantec.Workflow.Installer.WizardPages.SystemCheckPageUI.sbSaveSettings_ButtonClick(Object sender, EventArgs e)
   at System.Windows.Forms.ToolStripSplitButton.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

The actual install runs fine but I can't get a settings file out for re-use.  There are bunch of assemblies listed after the message but I have left them off to save space and I don't think they add any value.

Has anyone else seen/solved this?  Symantec.Workflow.Setup.7.6.4383.487.exe & Symantec.Workflow.Setup.7.6.4383.exe show this behaviour.  My install is on Server 2012 R2.