It doesn't seem to be working. Is it the same process as with other mods? Just download the file into 0ad mods folder and extract? Isn't even showing up on the invalid mods list
*Aw hang on I fixed it. Mod looks dope
Default is now to attack buildings (as of A27). Press the "Capture" modifier (by default it is "C" key) and right-click on a building you want to capture.