You can get Citavi from the RHRK website.
There you can download the program and activate the campus license.
A web version is also available for operating systems such as MAC OS or Linux, which is included in the campus license until the end of 2022.
Introduction to Citavi: This course introduces the essential functions of the reference management software, including importing and managing references, applying citation styles and creating publications.
Advanced course: This course is designed for all people who have already worked with Citavi and want to increase their knowledge. The focus is on creating reference lists and modifying citation styles.
All provided courses and the possibility to register can be found here.