The official website for downloading the JFK Assassination Files is the National Archives website. You can access the bulk download files at:

https://www.archives.gov/research/jfk/bulk-download

This page provides access to various releases of the JFK Assassination Records Collection, including large zip files containing PDFs and WAV files from releases dating back to 2017 and beyond. Note that download times may be significant due to the large file sizes. For more specific releases or individual documents, you can also explore the main JFK Assassination Records page at:

https://www.archives.gov/research/jfk