If you are running Windows 7 or 8, you will not be able to install Calibre 6. If you are running Windows 8, you can still upgrade to Windows 10 for free and then install Calibre 6. If you are running Windows 10 or Windows 11, try installing the portable version of Calibre 6.1 and see how that works.
But for now, install Calibre 5.44 as it supports the current Kobo firmware.
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