No, vBulletin 4 is EOL and vBulletin 5/6 are not and will never be supported. I would recommend switching to XenForo 2 (the forum this site is running) if you're interested in a modern forum software that has excellent customisation ability.
It also has SEO built in, so you don't need DBSEO (but you can redirect your existing URL structure to XenForo's).