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GATC activation fails (Win10/64)

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after a longer break, I installed GATC, new,  on my WIN10/64 machine. When starting the simulation, I get the message: "Activation failed. GATC will terminate in xx s."

My internet connection is active and serial was entered on installation. My valid order number is: 581772, of 4. September 2014 

Thank you

Bruno Löschenkohl

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