FWIW mine fails on the same file. I've tried a few times, including different sessions of Incognito, but seem to repeatedly get the same error with Llama 3 model:

"Could not load the model because Error: ArtifactIndexedDBCache failed to fetch: https://huggingface.co/mlc-ai/Llama-3-8B-Instruct-q4f16_1-ML..."