This happens if the link is broken or misspelled. Ensure you copied the exact address. Additionally, if the original creator deleted the image from their hosting site, the URL becomes a "dead link" and will no longer function. Low-Quality or Blurry Textures
Before entering any URL, examine it carefully. Official DLC links typically come from trusted domains. Shortened links (like bit.ly) can be convenient but make it harder to verify the destination. Some players have reported that DLC links redirect to different URLs than expected. Dlc Url For Truck Simulator Ultimate