@Mtt I just downloaded all my books from there (thanks!) but even with noDRM/DeDRM installed from your link, it isn't removing the DRM upon import. Hopefully @maique has better luck than me — this is always where I've gotten stuck.

A notification window indicates "This book has DRM" over a blurred landscape background. Text: "This book is locked by DRM. To learn more about DRM and why you cannot read or convert this book in calibre, click here. Close"