You won't be able to download the browser to campus machines due to permissions on campus machines.
Some machines on campus already have the browser, such as machines in the library. However, they do not have webcams which are needed to use Respondus Monitor which instructors may require. If you require a webcam you may need to use your own machine.
To begin a quiz, use a regular browser to go to BOLT and your course. Go to Assessment > Quizzes and click on the name of the quiz. There will be a button to Launch LockDown Browser rather than the "Start Quiz" button other quizzes in BOLT have.