Generally, students of the Open UAS pay for their own studies. If the studies aim at the development of professional skills, you should negotiate with your employer regarding the study expenses, and the possibility of carrying out studies during working time.
Studies at the Open UAS are not usually entitled to any student allowance.
The right of an unemployed student to receive unemployment benefit is mainly determined by whether the studies are regarded as full-time or part-time. Part-time studies do not typically hinder the payment of a daily unemployment allowance. The student should consult the employment authorities in the student's locality in advance to find out what kind of impact studies at the Open UAS have on unemployment benefit.