Sample data download in agentic_rag_with_nemo_retriever_nim.ipynb

The tutorial notebook agentic_rag_with_nemo_retriever_nim.ipynb does not work. The download of the intended sample data is failing. Download is implemented via the "KG-RAG-datasets" repo of docugami (link). It yields the following error messages:

Error downloading Study Protocol and Statistical Analysis Plan for NCT06155955: 403 Client Error: Forbidden for url: https://storage.googleapis.com/ctgov2-large-docs/55/NCT06155955/Prot_SAP_000.pdf
Error downloading Study Protocol and Statistical Analysis Plan for NCT06155006: 403 Client Error: Forbidden for url: https://storage.googleapis.com/ctgov2-large-docs/06/NCT06155006/Prot_SAP_000.pdf
[...]

Could not find an immediate fix or workaround.

打开 RAG/notebooks/langchain/agentic_rag_with_nemo_retriever_nim.ipynb 并检查示例数据下载步骤；复现来自所链接 KG-RAG-datasets 源的 403 响应。追踪失败发生在 notebook 中还是外部 Google Cloud URL 中。完成的标准是教程能够获取其预期的示例数据，或者 issue 记录经过验证的替代方案或 workaround。