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Hello Nader H,
this is a recording of one of the many live training sessions that Tableau puts on frequently. You can find a listing of these here: Live Online Training | Tableau Software and sign up for any of the Advanced Calc II training sessions at your leisure. This session is free and then you will be able to interact with the instructors in real time should you have any questions or issues.
In addition, as Lenny has mentioned, we have let the team responsible for this video know of the issues related to the quality and asked that it be replaced.