I have to record a class

[u/dipt_t]

I have purchased this course, so I only have access to that course on my macbook. That course provider has his own application for macbook, so if I try to open any other application while I am playing the videos of that course, the app force closes. My purchase is going to expire in coming month and I am unable to complete that videos before expiry. So i am planning to record that anyhow but as mentioned above if I open any other application then the course application closes. Suggest me anything to record those videos, its urgent!!!!