(P) Can a user's course completion status expire or get overwritten?

In general, no. Once a user completes a course, it will stay "completed" unless manually modified. However, if a course is configured with a Renewal Interval, the user's completion status will reset on the date selected on the Content>Courses>Course Details page.

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Note: For online courses, if you simply update the course with a new SCORM package, a user's completion information will not be changed.