Same here-meh.
JSGME is a piece of cake. You pick the mods you want, download 'em, and move 'em over when you want to install them, move 'em back over when you don't want 'em, and delete 'em when they make you pull your hair out.
Doesn't get any easier than that.
I tried the Unified Installer at AAA for IL-2:1946. All I got was corrupted downloads and frustration.

Made me wish for JSGME version for IL-2. I uninstalled everything and deleted files, reloaded the game, patched it, and am playing it un-modded for now.
I may give UI a chance again in the distant future, but it is not worth the trouble now.