Chat Software 2.29.1 Update is a HotFix for an Acapela problem that was stopping the voice on devices running Android 4. If you aren't having any problems with speech stopping on your system, there is no need for this update.
To download the Chat 2.29.1 Software Update, go to Menu>Help>Check for Updates on your device to initiate an automatic update or go to Downloads from this website, choose your language and download the appropriate Chat Software Update to manually copy to your device.