Best Practice presentations?

Hi,
I'm trying to find powerpoint presentations from previous best practice seminars. Links on the website which seem like they should go to a pdf, instead go to a page with a calendar of seminars. For example: https://software.broadinstitute.org/gatk/events/slides/1606/GATKwr14-1-GATK_primer.pdf
Where are the presentations actually stored?
Thanks.