The solutions below are ranked from the simplest and most likely to succeed to more involved steps. Try them in order.
When you perform a Zone En-core-pre-gfx file download, you are downloading a specific, unprocessed graphic asset pack designed for a very specific loader version. Using the wrong version results in garbled sprites or a black screen. Zone En-core-pre-gfx File Download
I can provide targeted troubleshooting steps for your specific platform. Share public link The solutions below are ranked from the simplest