The minimum requirement for MyTalkTools Mobile Lite or Mobile is iOS 5. IOS 5 is not available on 1st or 2nd generation iTouch. To find our your IOS version;
Go to your iPad (i-device) home screen and select Settings
First select General on the left side, next Select About
Look for 'Version'. This is your i-Device OS (operating system) version.
Please connect your iPad, iPod, iPhone to the computer with your iTunes account frequently to make sure you have the latest operating system version.
Find the latest ios version at wikipedia:
Go to Apple Support for help updating your IOS