I've just upgraded to Calibre 3.40.1.
The link to the PDF manual
on this page ist kaput. Has the PDF manual been discontinued, or is the link only temporarily broken?
Thanks.
EDIT: Oops....never mind! The manual did, in fact, download quietly behind the scenes, without the usual pop-up "Save to" window. (I recently upgraded to Windows 10, and am still getting used to its stealthy ways.)