Patch Details:

Fixed an issue where the wrong Video Adapter could be chosen resulting in the game not launching or failing to detect a DirectX 11 capable card.

Daylight still requires DX11 to run as per the system requirements. If you are still having problems, please make sure you have visited the troubleshooting in this thread: http://steamcommunity.com/app/230840/discussions/0/558754898830659515

Patch Followup:

It seems that we have fixed some people with the patch that was sent out last night but we have noticed that from your reports it might have broken some players. If the patch has prevented you from playing the game, we have added a version of the game without the patch on it so you can still enjoy the experience.

To use Version 1.0 which is the version of the game before we applied the patch, please right click on Daylight in your Steam library, go to Properties > Betas and select Version 1.0 from the drop down list.

We are still investigating all issues so that we can have one version of the game for everyone but this is a workaround that we are providing so that you can continue to enjoy our game. Thank you for your patience.