The only reason you should be looking for a copy of vBSEO at this point in the game would be if you were fixing a hacked site i.e. you are overwriting all vBulletin and mod related files to ensure they are 100% clean of infection (and of course this means you had vBSEO installed already but need clean files etc). If you're not doing that then you need to realize currently at the time of this post, vBSEO is dead, has been dead and more than likely will not return couple that along with the fact any of the old versions are extremely outdated and if I'm not mistaken vulnerabilities exist in any of those versions. Furthermore you should not be downloading nulled versions of any scripts from any websites if many of you had half a clue about what they embed and insert into some stuff you would be shocked and if you want to say some warez sites do not do such things then you be the fool and think there's honor amongst thieves, gullible is the term you're looking for.

If you're upgrading then before you perform the upgrade you should either:

• Remove vBSEO entirely, change to mod rewrite friendly url's in admincp and redirect old links to the new ones via .htaccess as well.
• Do as Zachery mentioned above and do not use seo tools.
• Convert from vBSEO to something like DBSEO.

Edit: Don't forget that many of you submit tickets to your host, if you submitted a ticket in the past and attached a copy of vBSEO, well then there's a clean version you can download! Only tip I could think of :p.

You cannot, so its your choice whether you trust them.