MAGIX (now Vegas Creative Software) offers modern versions of Vegas Pro. While a new perpetual license costs ~$399, they frequently have and upgrade sales for as low as $25. More importantly, you can download a fully functional 30-day trial —no authentication code required.
An authentication code for Sony Vegas Pro 8 (now owned by VEGAS Creative Software Sony Vegas Pro 8 Authentication Code
Here's how the authentication code works: MAGIX (now Vegas Creative Software) offers modern versions
To clarify, "Sony Vegas Pro 8" is a legacy video editing software released by Sony Creative Software in 2007. Because the software is nearly two decades old and the original activation servers have largely been decommissioned or transitioned through Magix (the current owners of Vegas Pro), obtaining an authentication code through official channels is no longer standard practice. Understanding the Authentication Process An authentication code for Sony Vegas Pro 8