Courses purchased with membership expire when your membership expires. Access is through membership and when the membership is no longer active, access to all the benefits, including courses expire unless the membership is renewed.
Membership is intended to be an ongoing product that allows a customer to have access to content and all the extra benefits of membership all the time, not just when your license needs to be renewed. Membership is an auto-recurring product where you choose when you want to make your payments – billed either every year or every two years. Your method of payment will automatically be billed depending on the frequency you choose. Your membership will auto-renew every two years regardless of payment frequency.
Courses puchased through membership, which have not been completed while the membership is active, cannot be extended in any other way than by continuing in (renewing) your membership.