TeamSpeak 3 Server update from 3.0.12.4 to 3.0.13.2 fails

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Hi, I've a problem with updating one of my customers TeamSpeak 3 server and I've absolutley no plan, what the cause can be. I've just downloaded the new server files multiple times, but the update fails all the time. All permissions are correct and the TeamSpeak 3 server starts, after executing... TeamSpeak 3 Server update from 3.0.12.4 to 3.0.13.2 fails