Hey there!
http://www.fileconvoy.com/dfl.php?id=g4267967564d9226499974201076f3e58bb77e03ea
This asset file was causing the cook process to fail with no seemingly reason at all, looking at the logs.
This is the end of the log i got in the me/Appdata/Unreal Engine/C+UnrealEngine+Games+4.9/ folder
[2015.10.21-14.12.19:293][ 0]LogSavePackage: Total save time: 0.833854ms
[2015.10.21-14.12.19:294][ 0]LogSavePackage:Warning: Finished SavePackage C:/Users//Sync/FE/Saved/Cooked/WindowsNoEditor/FE/Content/Data/Bindings.uasset
[2015.10.21-14.12.19:295][ 0]LogRedirectors: String Asset Reference ‘/Script/InputCore.Key’
[2015.10.21-14.12.19:295][ 0]LogRedirectors: Resolved to ‘/Script/InputCore.Key’
[2015.10.21-14.12.19:296][ 0]LogCook:Display: Cooking /Game/Data/AxisMapping_O → C:/Users//Sync/FE/Saved/Cooked/WindowsNoEditor/FE/Content/Data/AxisMapping_O.uasset
[2015.10.21-14.12.19:297][ 0]LogSavePackage: Save=0.817727ms
[2015.10.21-14.12.19:297][ 0]LogSavePackage: Async saving from memory to ‘C:/Users//Sync/FE/Saved/Cooked/WindowsNoEditor/FE/Content/Data/AxisMapping_O.uasset’
[2015.10.21-14.12.19:297][ 0]LogSavePackage: Total save time: 1.059026ms
[2015.10.21-14.12.19:298][ 0]LogSavePackage:Warning: Finished SavePackage C:/Users//Sync/FE/Saved/Cooked/WindowsNoEditor/FE/Content/Data/AxisMapping_O.uasset
[2015.10.21-14.12.19:300][ 0]LogWindows: === Critical error: ===
Fatal error!
[2015.10.21-14.12.19:300][ 0]LogExit: Executing StaticShutdownAfterError