Thanks for pointing this out.
The message about needing to login is a generic message in the ‘Downloads’ area as a lot of the content is only available when BAA members are logged in, for example the full Journal archive dating back to the first Journal in 1890. However, there is some content like the slides from this workshop where the restriction has been lifted.
I’ll add this issue to the list of development items for the website, though I am not sure if it will be possible to remove the message where the restriction has been lifted.
P.S. This old message jumped to the top of the list yesterday as it was being used for some website development testing.