Cause: neptune.cls loads xcolor with specific options, but your preamble also loads it with different options.
Fix: Remove explicit \usepackagexcolor from your document before loading the class. Let the class handle it.
Cause: Older versions of neptune.cls are incompatible with newer hyperref.
Fix: Update your LaTeX distribution. If the problem persists, manually download a more recent fork of neptune.cls from GitHub that patches the issue. neptune.cls download
run["artifacts/model_checkpoints"].download("./checkpoints") Cause: neptune
print("Download complete.") run.stop()