Many majors lock their store downloads in protected storage (only the app can use). Amazon is one of those that does this and also makes the DB less accessible to Calibre (The kindle collections plugin is limited on what it can do on post V4 era devices)
If your K1 (or early other eink models ONLY) is still yours, register it (it does not really need to work well), and use the Download and transfer by USB option on the (more) in the store.
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