Sorry, these instructions may seem somewhat obscure, but this is the only way to find a version of Moodle with access only to the “teacher”.
As a teacher, you should back up any of your courses (although this feature may have been removed in the Moodle you use). Backups are just zip files, but there is a .mbz extension instead. If you change this extension to .zip, you can extract the zip. When you extract the zip, open "moodle_backup.xml", there you will find the item "moodle_release" somewhere closer to the top, giving you the version of Moodle used to create the backup.
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