To get the default settings back for the Style Configurator, I unzipped the styles.xml file from the .bin.zip package. I had to download this package to be able to do so. This is not so much different from downloading and/or reinstalling the total Notepad++ package itself.

Will you think about enabling downloading of separate files?
It would be convenient to be able to download individual files form the .bin.zip package. I guess the file list could also be shown on the download page, including a hyperlink to download each separate file (from an original location, other than the actual zip-file of course). A small description of each file could be very useful for finding a (possibly messed up) file one wants to restore, like the default settings.