I downloaded this game today, unpacked it, and unfortunately it does not run for me. Several files are missing when I launch the Iragon.exe.
I was really looking forward to trying this game.
I'll try again to download the zip file again.
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!