I just checked your account and you still have access to all your courses.
You should be able to access them in your Dashboard once you login.
Some of the parts of the Master Course have been renamed since you enrolled:
2. Part 2 == The WordPress REST API
3. Part 3 == (I actually removed this for now and will be re-adding new content once React rolls into Core 👍)
4. Part 4 == Real World Projects
You should also see Gutenberg Development there. Please let me know if you don’t see it and we’ll get it figured out!