Description Thank you for downloading this update file from Zoo Admin.To use this update file, unzip it to your Desktop. Then move the .ztd file(s) into your Updates folder inside your Zoo Tycoon directory and the .dll in the main directory.Thank you for downloading this update file from Zoo Admin. To use this update file, unzip it to your Desktop. Then move the .ztd file(s) into your Updates folder inside your Zoo Tycoon directory and the .dll in the main directory. The default is