Fear The Wolves Early Access Invitation code not working

hello
i was one of the alpha tester in this great game , yesterday i received Fear The Wolves Early Access Invitation code and i activated it today after that i updated the game , when i tried to launch the game a splash screen appear and after the loading bar complete inside the splash screen the splash screen disappeared and nothing happened , i tried many times and restart my computer but the same thing , can someone tell me what is the problem ?
thx in advance

oh thank it works now , i reinstall it and everything fine
thx in advance

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