If you have reached the maximum number of activations for your product, please contact the Pro Audio Support team.   You can do this directly through the MAGIX Service Center:

https://www.magix.com/de/support/mein-service-center/

You can reach us by telephone Monday through Friday, from 10:00am to 3:00pm 

Or you can send us an email: samp_de@magix.net