Java and the Flex SDK are only required if you intend to create your own icons. Your options should look something like this when you are done:
Extract the Flex 4.6 SDK to a location on your computer.Click the … button beside the Flex SDK Path text box and select your Flex SDK folder.(If you have Java installed this field should be automatically populated for your.) Click the … button beside the Java Home Path text box and select your Java Runtime Environment folder. The mod adds more than 100 new units to the game, adds an intuitive ambush system (utilizing trees and foliage to get the drop on enemies), and recommends 32 maps to play with the mod.