My wife works with Dr. Chuck and helps produce the university of michigan's coursera videos. She says you should absolutely still have access to those videos, and if you don't you should contact Coursera's support.

If you paid for it on the old Spark platform (over a year ago) those classes were migrated to their new system so you might need to resign up, but you shouldn't need to repay. The URL to use for requesting is: http://learner.coursera.help