Uninstall method for "Strange UI" "corruption UI" and "Enhanced UI":
Skip the aoc.exe part for any other custom UI
Install method for any UI:
1 - Download a custom UI. Do not extract the .zip file.
2 - Execute AOCUI Installer as administrator. Once opened, select the correct paths (The first is for the game directory, and the second for the .zip of the custom UI you downloaded), choose the options you like and then click on "install".
3 - Done.
Just remember one thing: if you have aoc.exe somewhere on your computer; make sure you deactivate it before you delete it or the game won't launch.