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Hey Nightmare, thanks for your advice.
But on Win 8.1 is the .Net 4.5 already in the system. And what I wrote before my system is up to date. ;)
I tried to reinstall the 4.5.1 and the system says...

The Problem isn't on the .Net Installation.
I hope you'll be able to read the Error-Message - because is in German. ;)

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In the Box is this message:

Informationen über das Aufrufen von...

Yes, it works on win8.1 - but I get always a error with the new Feature. "Aiming Down Sight (ADS) Modder"
In the Game appears a Error-window "There is a problem with the Net-Framework". My System is...