Megascans assets may not be sold or resold, regardless of how modified they are. Copyright isn't transferred when downloading assets from the library. Essentially we don't permit users to compete with the Megascans library by using the library to do so.
I read the license but that is not clear to me, can i use materials from megascan (free) to create content to sell on unreal marketplace? No selling the materials of course, but rather using them as a starting point to texture assets like chairs, tables etc..