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Are you asking about how to put it into Comp/Con or where to find the file?

If it's the latter: For the paid/premium version of the core book, the NPC data is listed alongside the other downloads.

If you don't have the material associated with your itch.io account: I believe that if you got it on BackerKit, you should have received an email with a link to an itch.io page where you could download/access it from.