Here the post with the changelog for Barbarian v2.18:
Watch out for Barbarians new archer micro in feudal and early castle age. It trys to move the units in groups and will focus fire single units of yours. So it doesn't just patrol in, but stops to shoot alltogther at one of your vills at your lumbercamp or one by one at your stray archers or what ever.by _II2N_ » Sat May 19, 2018 9:46 am
Updated to v2.18. Last update was... two years ago?
Added DUC attacking system for early game on land maps. Barbarian can handle up to 3 different unit groups, each of which is handled separately. They may have different targets and in case of ranged groups, they are capable of grouped unit micro. Groups try to find a safe route to their target, attempting to avoid towers and TCs. The system can still certainly be improved a lot.
-Barbarian tries to place farms nicely around the TC.
-Fixed several issues in boar hunting
-Reduced retasking of villagers at castle/imperial.
-Made changes to unit selection in both 1v1 and TGs.
-Improved drush micro (still needs more work).
-Trapped villagers are detected on nomad start.
-Scouts in Barbarian team can coordinate to hit enemy villagers in some cases.
-Not all villagers garrison against enemy scout at start
-Buildings are placed closer to villagers
WK support added.
You will like it
For UP you can see the Updates from v1.4 to v1.5 at http://userpatch.aiscripters.net
UP1.5 makes WololoKingdoms possible, the mod to play the HD expansion civs with AoC+UP, which therefore makes it possible to play via voobly, which is important for a lot of pro-players.
There has been great improvement especially for multiplayer in terms of lag.
A small but noticeable feature is, you can now rotate gates using your mousewheel.