Check your organ's software version by looking in the menu of your LiVE III.
Menu > System Settings > Version
If you are not up to date, you can download the latest version here:
Copy the firmware file "jho.uc3" to a memory stick
Plug the memory stick containing the firmware file into the USB portal at the front of your LiVE III
Navigate to Menu > System Settings > Version > Update organ and confirm by pressing 'enter'
Select 'yes' and confirm by pressing 'enter'
Wait until the new software has been installed. Your organ will restart itself.