The first half is taught in period 1, see https://mycourses.aalto.fi/course/view.php?id=33228.
Notice that passing the period 1 course is a mandatory requirement for being able to take the period 2 course. If your passing of period 1 is pending subject to the December retake exam then you can participate in the period 2 course.
Make sure to read the syllabus carefully before registering for this course (link in the side panel at MyCourses). Note that the ongoing Corona virus pandemic may still cause changes to course policies.