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Because Windows 7 and Windows 10 are two versions of Windows. Just like Ubuntu 12.04 and Ubuntu 18.04.
calibre needs a modern version on each of 3 OSes it supports. Windows 10 is not, by itself, better than Ubuntu 18.04 or macOs mojave to run this software.
You like Windows, you use Windows, and you, somewhat, think that Windows is better not just for you but for everyone else out there. So it is normal for you to look at a problem you don't understand and take it as a prove that your previous conclusion was right.
Think about it, it's a self-fulfilling prophecy.
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