If you try to load the 30-million-poly version into a game engine, you will crash. Use the decimation master or the included LOD system. For most medium shots (waist-up), the 500k poly version with 4K textures is indistinguishable from the 8K 30-million version.
Given that MetaHuman now provides (with a compatible game engine workflow), the practical value of static, unrigged, pirated base meshes has significantly declined. If you try to load the 30-million-poly version