you can manually copy an old art directory back over
but... today they are doing some major updates. The fun thing is that the format that the art is in is changing so it would be best to download all new art anyways. I'll look into why its looking in odd places, I tested it in vmware and it worked for me both with default directories, and with a manually selected directory. Either way you should be able to cd into the directory you installed it in and run ./updater --auto but I'd wait until they notify everyone that the updates to laanx and the client are done and that could take a day or two.