Where did you find that central.utils and central.signup?
I found this central.utils in the signup.py in the erpnext_com repo where there is a line supposed to import get_signup_domain from the central.utils (used in the signup form in the erpnext.com).
But when I run it, I got this error “ImportError: No module named central.utils”. And I don’t think there is central.utils in the erpnext_com repo.
I have asked around but nobody answers, hence I’m curious where you find those central.utils and central.signup.