I'm not familar with the DB structure post 3.6 - so i'm not sure. I didn't bother with my maintenance update because of how tweaked I had this one forum. Sold off my other 2 licenses before 4 hit. Been out of it for a little while. So my latest download is in the 3.5 seed unfortunately...
I haven't wanted to upgrade my custom site in years. Running on 3.5 . Never was a fan of the interface on 4 or the whole fiasco that went on with vBulletin in general. Plus the licensing is now a joke.
Found XenForo and it seems exactly what i'm looking at for my upgrade path. Planning on...