Many people may have encountered the problem that if they have C&C Ultimate Collection or Origin version of Kane’s Wrath, they cannot install custom maps. The problem can be solved as follows:

• If it’s the Origin version, download the fixed C&C launchers (they fix all games in the Ultimate Collection, but only if they are already installed)
• Optionally download the map pack (which contains many maps)
• Copy the contents of the Maps folder to:

C:\Users\[Username]\appdata\roaming\Command & Conquer 3 Kane's Wrath\Maps

• Start the game, and if everything went well, you will see the maps.