Calibre converts almost any file type into almost any other file type, so you can read whatever you want, wherever you want, no matter what format it’s in. It’s free and runs on Windows, Linux and Mac.
Buying consumable content online for immediate consumption is wonderfully convenient, but the trouble is that you can lose it again just as easily, or the company can shut down its store. It’s worth learning how to download your digital content – and once you have it on a computer, what you can do with it suddenly expands.
See https://www.theregister.com/2022/01/21/friday_foss_fest_calibre/
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