You need to see this for improve your mod for contest

Free infinity blade collection now available in the Unreal Engine marketplace!

This content represents a $3 million investment in art and sound design, and we can’t wait to see what you make with it.

Free infinity blade collection now available in the Unreal Engine marketplace! - Announcements and Releases - Unreal Engine Forums!

Download: Content by Epic Games - UE Marketplace

The quesiton is: Is UnrealEngine Marketplace compatible with ARK Dev Kit?
Unreal Engine MarketPlace use the last version of Unreal Engine (4.9) and ARK Dev kit use 4.5. We can use this marketplace for ark mods?

Meshes and items you can meld with the Blueprints is… code… probably not.

Infinity Blade content is for UE 4.9 and causes the ADK to crash. I have tested it.

There is no downwards compatibility. Same with all marketplace assets. You are good to go if they were released before 4.6. Anything later will not work.