The vbulletin blog? It's available in the members area over on vbulletin.com. It isn't free - you need to pay for it.
I see that...I cant seem to just be able to buy just the blog. You have to enter a vbulletin liscense to go to the next page. On the next page you can check the box for the blog. Then i unchecked my liscense purchase, which I allreay have and it kicks you back out. Cant you just buy the blog by itself.
You need to add the blog to an existing license - it gets associated with a particular site you own.
If you have further questions about it, you should put in a support ticket to vb.com
Ok I finally got it...but now when my members try to post a blog they get the database error page. I just installed it just like it said. Have I not done something to make it work?