I’m trying to register matlab with the activation key I got from UMass Lowell and but its coming back invalid. I had it activated before two semesters ago for another class so that may be the reason but im not sure how to get a new code. Please Help.I’m trying to register matlab with the activation key I got from UMass Lowell and but its coming back invalid. I had it activated before two semesters ago for another class so that may be the reason but im not sure how to get a new code. Please Help. I’m trying to register matlab with the activation key I got from UMass Lowell and but its coming back invalid. I had it activated before two semesters ago for another class so that may be the reason but im not sure how to get a new code. Please Help. matlab activation MATLAB Answers — New Questions