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Those multiple files are how KFX is distributed. It does allow starting to read before a download is completed. OTOH, copying KFX downloaded on her computer directly to her Kindle will not work due to DRM (all KFX ebooks are infested with DRM, just that some have a common key which Amazon claims is the same as being DRM free). OTOH, if your friend has a Kindle registered to the same account that their computer application uses, she should just be able to download the files over the air.
When you import KFX books to calibre, the multiple files are combined into a single file so you don't see the multiple files you will find on Amazon devices and applications.
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