Unity vs Unreal Engine RPG Content?

Distribution UE Marketplace
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1

I have seen some unique cool content and it is only for Unity on youtube. I wonder if Unreal can contact those creators to make their product also available to Unreal Engine. RPG and MMO UI 6 - YouTube
http://www.evilsystem.eu/

2

why dont you make it yourself? if its a plugin it wont be that easy to just port it to unreal.

3

Copyright? I have no idea whatsoever how to make something like that.