When I start Art of Illusion, it tells me, “Unable to locate Plugins directory.” What is wrong?
The folder containing ArtOfIllusion.jar should also contain a folder called Plugins. If you have moved or renamed that folder, it will not be able to find it. Also, make sure that you are launching Art of Illusion exactly as described on the Downloads page. In particular, be sure to cd to the ArtOfIllusion directory before executing the java command.