To access to course materials or a Moodle from a previous semester:
If you have graduated and no longer have access to your Bilkent email address, contact support at moodle@bilkent.edu.tr using your alumni email address, available via the Alumni Information System: https://w3.bilkent.edu.tr/bilkent/alumni/.
If the course instructor has made the old course unavailable, contact them to request access and cc Moodle support.