Dripped content

Hi guys

I have read this tute on dripped content: https://premium.wpmudev.org/blog/drip-feed-your-content-with-the-wpmu-dev-membership-plugin/ but have some questions.

1. On the progress page, won't the previous weeks then disappear when people move from Week 1 to Week 2 etc?

2. How would you configure it such that
a) you charge someone for say 12 week subscription
b) they remain at Level 1 forever
c) at the end of 12 weeks they still have access?

What I need to do.
Charge someone for 12 weeks access.

I want to be able to reveal content 1, 2, 3 etc weeks after sign up, BUT, they MUST maintain access to previous weeks.

The tute seems to imply that for level1 for instance, they have access for a week, then they lose access?

So, what happens after a finite period ends?

I really need help with this, thanks!
Tim