As I said... Only one of the KoboTouchExtended and KoboTouch drivers should be enabled within calibre.
They can BOTH be installed but only ONE enabled.
It is YOUR choice as to whether you want to read books from calibre in EPUB or KEPUB format.
If you DON'T care at all about reading YOUR books in KEPUB format don't even install the KoboTouchExtended driver; just stick to the default KoboTouch driver,.
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