Common fixes for Turmoil on Steam mentioned in the discussions include:
Removing this file in the Steam userdata folder can fix launch errors. Clear Download Cache: Through Steam Settings -> Downloads. Turmoil_Fix_Repair_Steam_Generic.rar
In the Steam directory \SteamLibrary\SteamApps\common\Turmoil , right-click Turmoil_PC_Full and select "Properties" to set compatibility to "Windows 8". Common fixes for Turmoil on Steam mentioned in