If you make a change to an existing module, anyone that has previously completed the module will still have it marked as completed. However, moving forward, anyone who attempts the module will have to complete the updated version.
Effect That Changing a Module Has on Learners
This article explains what happens when you change a course that has users that are already enrolled and have begun their training.

Written by Stella Lim
Updated over a week ago
Updated over a week ago