I did the same thing as the guy above... I downloaded XenoMC and extracted the file to my desktop. Then i opened XenoMC by right clicking it and hitting "run as an administrator. Then after that was opened i opened my first tibia client by also right clicking it and hitting run as administrator. And then i tried to open a second tibia client the same way and it came up with the error 29: you can only run one tibia client at a time. i cant figure it out. This is so frustrating.