Browse to the magix.com website, click the My Account icon top right of the homepage and login in with the email address and password you registered the software with.
On the next page click My Products - there you will see you registered products, serial number and a download link if you ever need to re-install.
Please do not hijack another users topic which is on a totally different topic. Please create a new topic unless an issue you are having is already the subject of another users topic.