@scioneffect: Thats because not all, but most run on vanilla vB install's, so it's much easier..here in this case, vB.org has custom code to convert over to 3.5, aswell as code new features into the hack's system to make finding certain modifications easier to find..
yeah granted m8 ..... Was just after a bit of info thats all ...
its not an easy job to just upgrade in vb.org's case because they have alot of modifications made to it and nearly all of them will not work at all with 3.5 so it will take ALOT of work.