No version of Vegas has Blu-ray authoring. It can burn HD video to a data disc, but that's not authoring. It's just a video file on a disc -- no menus, no alternate streams, or even multiple videos (as far as I know). Sony's Blu-ray authoring code wasn't ready when DVD Architect Pro 4.5 came out, so it was offered in the free DVDA Pro 5.0 upgrade.