When launching the game I get a "Failed to initialize BattlEye Service: Windows Test-Signing Mode not supported." error.
Please disable test-signing mode by following this guide: http://support.microsoft.com/kb/2509241. Alternatively you can follow the manual instructions provided here: https://msdn.microsoft.com/en-us/library/windows/hardware/ff553484%28v=vs.85%29.aspx. If you are using hardware that requires driver signature enforcement to be disabled please check the vendor's website for newer drivers. Unfortunately, due to our goal to provide the most effective protection possible we cannot support systems running in test-signing mode in any way. We ask for your understanding.
This answer is copied from BE's FAQ and slightly adapted to be Unturned-specific. Click here to visit the BE support page.