Ok.

No related errors in eventvwr.

And this is what I got from the software:

Version: Sublight;2.6.1
Code: ERR-229922567
Details: OS: Microsoft Windows NT 5.1.2600 Service Pack 3
CLR version: 2.0.50727.42
CPUs: 2
Exception.Name: MissingMethodException (System)
Exception.Message: Method not found: 'Void System.Net.ServicePointManager.SetTcpKeepAlive(Boolean, Int32, Int32)'.
Exception.Source: Sublight
Exception.StackTrace: at Sublight.MyUtility.SublightSoap.DiscoverUrl()
   at Sublight.FrmSplash.OnShown(EventArgs e)
   at System.Windows.Forms.Form.CallShownEvent()
   at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbacks()Is generic error: yes

Session: 00000000-0000-0000-0000-000000000000

Same problem here. It gives me back an error page with some info and I clicked on "sent". In the meanwhile I've downloaded version 2.5.8 from Filepig and it works fine as usual.

If I launch the update it installs it but when I launch new version still gives me the error.

The difference I've noticed is that when I try to install the new version the installer starts a DOS window that works for a while writing the created files/dlls and that thing doesn't happen with the previous versions.

I'm using XP SP3.