If you are having a problem with the game just going for the safe launch window and immediately crashing after that i have a solution for you. This should work if you are using external usb amp/ audio device.

- Disconnect the usb cable from the amp/ card.
- Plug your headphones straight to Computer's 3,5mm audio jack.
- Enjoy the game

This should also work with Metro Last Light Redux.

Now some fun stuff for google: Metro 2033 Redux Not Launching / Metro Last Light Audio Problem