Can students who have completed the DMPCP apply for the new certificates (without taking any modules)?

No. If you completed the 25-module Disability Management Practitioner Certificate Program (DMPCP) before the four individual certificates were introduced, you already hold a credential covering that same content, so it can’t be issued again as four separate certificates. If you’re currently working toward your modules now, see “What happens with students who are currently registered in the DMPCP” above — different rules apply to you.