737 Immersion Instalation Problem

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Hallo friends of Simulation

I bought 737 Immersion at simmarket today. After installation came the following message:

 Installation Error: System.InvalidOperationException: The collection has been changed. The enumeration process may not be able to run.
   at System.ThrowHelper.ThrowInvalidOperationException (ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare ()
   at System.Collections.Generic.List`1.Enumerator.MoveNext ()
   at A.c.A (Boolean)
   at VFXCentral.MainWindow.A (Object, DoWorkEventArgs)
   at System.ComponentModel.BackgroundWorker.OnDoWork (DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart (Object argument)
 
I tried unsuccessfully to get help from the manufacturer. I use only the FSX.

I have no idea what the message is and how I have to perform the installation now.

I hope someone knows the problem and is ready to help me.
Thanks and best regards
Martin