Could you tell me, what files are missing or what the error is?
The errors, you have, are from missing DirectX. You will need to install DirectX 10 or higher.
Or
You can also try opening UE4PrereqSetup_x64.exe which will install all prerequisite for the game. You can find it in:
IragonBETA\Engine\Extras\Redist\en-us\UE4PrereqSetup_x64.exe
I hope this fixes your problem!