Hello @w210477964 
Welcome to the Canvas Community. Thank you for posting your question. My initial thought is...are you downloading the Lockdown Browser from Respondus' website? If so, it's my understanding that downloading the "generic" version of Lockdown Browser will not work. You need to be downloading Lockdown Browser using a specific link that your instructor should have given you. (See the first bullet point in the section "INSTALLING LOCKDOWN BROWSER".) The reason for this is that the specific link is tied to your school/course, and there is some kind of "connection" made on the back-end to say, "Yes, this is the approved Lockdown Browser, and yes, Raneem Siam can take the exam." So, I would recommend contacting your instructor to make sure that he/she is providing the link for you to download Lockdown Browser properly. You can use the "Ask Your Instructor a Question" link described in this Guide: How do I get help with Canvas as a student?. I hope this information is helpful to you. Good luck!
