Duplicating courses:
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Navigate to Courses

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On the course you wish to duplicate, click Duplicate

Duplicate a course from inside a course.
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Navigate to Settings in the course you wish to duplicate

2. Under General click Duplicate Course
Creating Course Versions
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Navigate to Settings on the course you wish to version
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From the left hand menu click Course Versions

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Click Select Version to enable that course version.
It is possible to publish course versions.
If you make changes to a version you will need to Publish the course again for those changes to be available to users of the course.