LockDown Browser is a locked browser for taking quizzes in Moodle. It prevents you from printing, copying, going to another URL, or accessing other applications during a quiz. If a Moodle quiz requires that LockDown Browser be used, you will not be able to take the quiz with a standard web browser. LockDown Browser should only be used for taking Moodle Quizzes. It should not be used in other areas of Moodle.
See the attached guide on how to install, take a quiz and troubleshoot issues that may occur.