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CBS 2 Activation Failed

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I installed City Bus Simulator Munich when i had Win 7 and it worked fine. Now, after the upgrade to Win 10, when I start it a warning message appears that says "Activation Check Failed!". I uninstalled the game, I reinstalled it and entered my Registration Key and it said activation succesful. Then, when I started the game, it gave me the same warning: "Activation Check Failed!". What am I supposed to do?


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