[NEED] Program for record the screen for 9 hours +-

i paid for a amazing course of growth hacking and it will be gone soon (30 days)
I need to record this course to watch more times, each class its +- 9 hours.
Any free video recorder or something like it?
Any idea?
Already tried to download with Torch, didnt work.
i think i rlly need to record. :/