As far as I know, the latest version is 2.5.5
That’s the one I use, and more visually appealing to me. It has the wonderful checkmark option for deactivating the appearance of the off-hand weapon, so I can walk about and fight with a sword and a free hand - as I always envisioned in fantasy films and books, as Conan always fights. I really, really, really wish Funcom implement it in their UI. It could be auto-deactivated in PvP, if that is relevant there.
As for making the left character menu of Default UI Enhanced more compatible, maybe you can try this thread:
It restores the official character menu (with Funcom’s up to date features), and you still maintain DUIE in any other menu. Sadly - for me - that is where the loving ‘hidding off-hand appearance’ is.
Maybe some more knowledgeable and charitable soul can update it to have all the features.
Just remember to always backup first any file you’re about to delete or change, so, in case it doesn’t work, you can just put it back again. 
Hope this helps in any way.