Downloaded the free Open World Demo Collection off the marketplace but when I imported it into my level, none of the materials would render properly.
Idk if this is a bug or some problem with the import
Hi SuperSaiyanBro9,
The assets in the Open World Demo have extremely heavy textures and materials, and as such may take some time to fully load. Try leaving it open for a bit to see if it is just taking additional time. If not, check the meshes to see if the materials are properly referenced in the details pane.
I waited and it still never compiled correctly. Opened the Materials and the texture coordinates are giving me an error saying “Error [SM5] (Node TextureSample) TextureSample> Missing input texture”
So I’ve been trying to fix all the MAT to have the right texture, some materials don’t even open the blueprints, just a preview. Also i have to set the Material on the mesh. All the assets defaulted to WorldMaterial.
But the only way I have found a way to fix it is to go through all the materials 
What method did you use to add the content to your project?
I downloaded it onto my mac and then moved it over to my pc, cuss why download it twice. But all the materials instances aren’t loading
Most likely some references were broken when you moved your assets.
To avoid it happening, ensure that you are following this procedure, when migrating your assets.