How could I deal with this when I used a free asset from Epic Games itself?

[Vinicius_Pires (Vinícius Pires)]

You see.. when you get something, even for free, from Fab (Deceased unreal engine marketplace) you get a license. You could not in any way distribute it commercially if you don’t have the license.
You can check more in this post:

@ZenLeviathan

@Royday According to Unreals licenses, you should definitely be able to share within a team/organization, for organization. I believe it really depends on each asset specifically, just because the creator retains their Intellectual Property Rights.
I believe most assets are able to be used in shipped games/projects, the only ones that are specifically mentioned to be excluded are:

“Without Epic’s written permission, Marketplace products created by Epic for an Epic game may not be used to create sequels or recreate, emulate, or republish those games.”

So it seems as long as it’s not Epic’s Assets to be used to re-create their games, it is okay.
But, I’d also have your friend help make the games as a precaution.
I hope this helps, and let me know if you have more questions!
-Zen

Full post: If I got assets from my friend can I use & sell ? - #5 by Royday

I mean, i really don’t want to create any kind of commitment for either side by just passing you files. I will research more and try to find more answers for you.