The 50% off discount is for students currently pre-enrolled or enrolled in a active course. It is also only for students that have paid the course fees up front (not month to month). If this describes you then there are a few reasons why it could happen.
1) You just paid for your course and we have to activate the 50% off discount manually and may not have gotten to you yet. This usually occurs with in hours of paying for enrollment but may take up to 24 hours.
2) You have not gone to the checkout page yet. The discount wont show in the mini cart preview on the menu bar but go to the checkout page and you will see the discount before you pay.
3) We hope it never happens but there may be a tech glitch or an issue on our end. If you do not see an email from us in 24 hours max from when you paid for your course please email us at firstname.lastname@example.org and we promise to fix it ASAP.