This forum cannot give you any keys/serial numbers. If you registered your software after you bought it from a legit source (Sony Creative Software), you may find the serial number and download link on your MAGIX account. In this case I doubt it though.

Note that :A list of your serial numbers from Sony Creative Software is still available at https://www.sonycreativesoftware.com/myaccount/mysoftware

Of course you need to have bought and regstered it at that website and know your old log-in details there.

Good luck.