Open calibre, go to Preferences, Plugins, check the box for user-installed plugins (right above the list), expand the device drivers list, and double-click KoboTouchExtended. I'm on my phone, not near a computer, so it's possible some of those directions won't be the exact names you're looking for.
Is there a particular reason why you want to save each converted KePub? Depending on what you're trying to accomplish, there may be a simpler way than using this debugging option.
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