11
find out exactly what version of nuke you have, and then you can download some of the older releases, and start upgrading
i'd suggest trying nuke 6.0, see if you can get 5.5 to upgrade. keep in mind you haveta upgrade the forum to bbtonuke along the way for my script to work. also, if i were you, i would do all the upgrades on a test site (copy of the real site), and test it along the way to make sure shit don't break, lol
then try nuke 6.5 maybe, and then nuke 6.8
http://nukecops.com/downloads-cats-1-10-10.html