Since there have been no official product sales of Vegas Movie Studio for over a year, you will probably need to contact the vendor you purchased it from, and hope for the best.
Support link for Vegas is at the top of the page, we are just a user forum here.
@THILBER If you have purchased a recent version of Movie Studio later than version 17 then what you have is not Vegas Movie Studio but a Magix version. It's actually Magix Movie Edit Pro renamed. For assistance you need to post on the Magix Community forum https://www.magix.info/us/video-forum/. You will find a Support link there.