Things like this are why I highly recommend getting into the habit of making a DRM-less backup copy as soon as you buy the book. Apart from anything else it saves you the future headache of having to do a great big bulk operation on all your books.
It's also an early warning system in that as soon as you start to have difficulties with a new book you can decide what to do. A few years back Amazon started making it increasingly difficult to use K4PC - forced updates and KFX-only downloads - and at that point I took the decision to stop purchasing from them. It seemed clear that the changes were deliberate and it was only going to get harder.
I have bought a handful of books since then that aren't available elsewhere, and I have some comics from my old Comixology account that were never available in DRM-free form (most were and I downloaded them at the time). The later I'm happy to read using the Kindle app or web reader.
Interestingly I've just discovered, because of this thread, that the book I bought in December which wasn't available anywhere else, is now not available on Amazon either but is still in my library and downloadable. Although I have a copy anyway per my original statement.
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