When an institution purchases a Respondus license, they are provided with a unique download link. If you do not use the institution-specific link you need, the version you install will not work.
Resolution
To download the Lockdown Browser, please use the link provided to you by your instructor. Once you have the appropriate link, you can follow the instructions here to install: https://web.respondus.com/respondus-lockdown-browser-the-student-experience/.
You may download the Respondus Lockdown Browser for Lakeland Community College using the links below:
Windows: http://www.respondus.com/lockdown/download.php?id=587634126
Mac: https://download.respondus.com/lockdown/download.php?ostype=2&id=587634126