: If the software is still installed on an old computer, go to Help > Deactivate the software on this PC
Since MAGIX acquired the Vegas line from Sony in 2016, all activations are managed through them. Log in to the MAGIX My Products page to see a list of your registered software and keys.
Sometimes the activation window requires administrative privileges to write the license file to your drive. Final Verdict
To find a working serial number for Vegas Pro 17 , you should access your registered account on the MAGIX My Account