Re
I've reinstall the the "Conversion Output KePub" from the zip file in Calibre 2.8 version :
https://www.mobileread.com/forums/sho...d.php?t=220565
test OK
I've also re-update Calibre to 2.13 and test again to convert epub to kepub, it's work fine !
I don't know/anderstand why it have crashed !
Thank's PeterT (and other) for your help