Sony Vegas Pro 9 is strictly a Windows application. Released in 2009, it was built exclusively for the Windows architecture and has zero compatibility with macOS—no native version, no wrapper, no official support. If you're on a Mac and trying to run Vegas Pro 9, you've hit a hard wall.
Magix acquired the Vegas brand from Sony in 2016 and rebranded subsequent releases simply as "Vegas Pro." Starting with Vegas Pro 14 (2017), Magix introduced macOS support—but it was limited and eventually discontinued. As of 2024, Vegas Pro remains Windows-only. Version 9, being a Sony-era release from 2009, never had a Mac build and never will.
If you absolutely need Vegas Pro 9, you'll need a Windows environment. Options include:
Modern Mac editors are far more capable than Vegas Pro 9 ever was:
Vegas project files (.veg) don't translate directly. You'll need to export stems (individual audio/video tracks) from Vegas on a Windows machine, then rebuild the timeline in your new NLE. AAF/XML export isn't supported in Vegas 9. Plan for a clean break rather than a conversion.
Vegas Pro 9 on Mac is a dead end. Invest your time learning a modern, native editor—DaVinci Resolve's free version alone outperforms Vegas 9 in every category. The learning curve pays off in stability, performance, and future-proofing.