Would like some advise / ideas how to create the best solution for the following problem:

A client wants to sell courses. I use the Community Store, and when buying a Course I can add the user to a special Usergroup, so they get access to a page containing the courses.

But every course gets a update (video + exercise) every 2 weeks.

My best idea so far is the following:
- Create a course page and displaying a pagelist with the child course pages
- Giving the child pages a password (with plugin)
- Sending the passwords to the user every 2 weeks

I think this will work, but it's a lot of work.
Is it possible to turn this into an automated process?

Maybe the pagelist can show the links in a interval (days) per user (from date added to special group)? Or maybe use a plugin?