If you're serious about video editing and want the full power of Vegas Pro, the current version (now called VEGAS Pro, version 20 or newer) is available for purchase from the official website. Pricing typically starts around $199–$299, and you get:
in 2016. Because Vegas Pro 13 is a legacy version (released in 2014), it is no longer sold or supported by the original manufacturer. Modern Alternatives : You might consider the latest version, VEGAS Pro 22
Completely free, open source
Under "My Products," you can view your registered serial numbers and download the final installer build for Version 13.