Set "Max Simultaneous Downloads" to 1 or 2 to see if the error clears.
Before diving into fixes, it is helpful to understand the mechanics. JDownloader splits files into multiple "chunks" or segments to increase download speeds. When a segment fails to load, it is usually due to one of three things: jdownloader segment not loaded new
If you are staring at a stuck download bar, here is a comprehensive guide to understanding why this happens and how to fix it. Core Reasons for the "Segment Not Loaded" Error Set "Max Simultaneous Downloads" to 1 or 2