What's working for me at the moment on my T1 is to go to:
https://www.kobo.com/us/en/library
in the browser. Substitute "us" and "en" with your own country and language of course.
It lists my books, and to the right of each one are three small circles which lead to a menu with a "download" option.
PS: Also it's worth pressing the browser's
♡ button and adding a bookmark, to save remembering it.