The MasterStudy LMS Pro (1.3.1) plugin contains two addons - Udemy Course Importer and Prerequisites. This manual shows how to set up the second - Prerequisites addon. You can read about Udemy Course Importer addon here.
Setting up the MasterStudy Prerequisites addon
You can enable the Prerequisites addon in the STM LMS -> LMS Settings -> Addons section of the WordPress dashboard menu.
After, you need to edit a needed course and set up prerequisites settings of a course in the Course Prerequisites section.
In the Course Prerequisites section, you can add courses which should be completed before purchasing this course.