When you are looking at a course (either after selecting it in the course finder, or as an evaluator in the Evaluation Tracker) you can click on the catalog dates displayed as part of the VERSION HISTORY to list all versions of the selected course.
Some lists are much more extensive than others depending on the available catalogs for a selected school.
In this example (from University of Northern Colorado) you can see that there is an extensive list due to the fact that the course is currently found 23 catalog versions in TES (22 pictured). You can also see that that course has undergone a fair number of changes. The description has changed over time. The course initially included the Laboratory section as part of the course. In 2013-2014 a curriculum change resulted in the Laboratory portion of the course being broken out into a separate course, as has been the trend across the industry, allowing the students that satisfactorily complete the lecture portion of the course, but struggle to complete the Lab to re- take just that portion (or vice-versa).
This version history can help an evaluator determine what the course included at the time that the student took it, to determine the appropriate equivalency at your institution.