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Amazon: Older Kindles can no longer download e-books
(www.heise.de)
This is a most excellent place for technology news and articles.
As far as I know, it might still work with Calibre
My kindle has never been connected to the interwebs. Always used Calibre, wonderful software. About two weeks ago I used it to transfer books, worked with no problems.
This is about the Kindle Store. Calibre will continue to work, it just copies files via USB, you don't even need Calibre for that.
Can books be transfered via USB even on the 2013-era Paperwhite? I've always used the email feature in Calibre-web to send books to my Kindle (even for books I've paid for) - I didn't realise it was doable over USB!
Have a Kindle Paperwhite (1st gen). Have send over USB, through Calibre - software, never used the web one -, books and documents in various formats. Never had an issue.
Yes, it's basically just a USB drive, no special software required.