Where to save SetupWizard.php on child theme?

So, the title itself is pretty self-explanatory.

I want to know what’s the correct way of saving the /dokan-lite/includes/Vendor/SetupWizard.php on my child theme.

I’ve tried saving it in a directory called /dokan/includes/Vendor. I’ve also tried to simply save it in /dokan/, and also inside /dokan/includes/, but none of them seem to be the right way.

Could you help me with this? Thanks.

The page I need help with: [log in to see the link]