arch_model.pdf download button not available under lecture, just preview

Hi 365datascience,

First of all, thank you for making the coursework material available through April 15. I am aware the video lectures are not made available, but the notes are consistently available via a download button, which made me think this may be a missing link.
The lecture is from the "Time Series Analysis in Python", on section "Arch Model", specifically "The arch_model Method": https://learn.365datascience.com/courses/time-series-analysis-in-python/the-arhc-model-method Normally the download button is available below each note, but in this case "arch_model.pdf" contains no button!