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https://www.cloudwards.net/remove-drm-from-kindle-books/
This currently works, but I don’t know if it will continue working forever - probably not too much longer after this announcement.
The “old Kindle PC app” might keep working in the future, but my guess is that it’s going to be done soon as well.
edit: One thing I ran into was after installing the kindle app and turning off the auto-update, it still updates. So keep the installer handy and just reinstall it as needed.
Yeah, it’s been hit and miss with downloading from the Kindle. I mostly get books from the library and strip the DRM from there. I figure it’s a win-win, because the library gets a record of the checkout, but then I get to read it at my leisure while the next person gets to read it.